Strict Standards: Non-static method AL_HELPER::SetupPaths() should not be called statically in /home/software/public_html/guides/init.php on line 66
Strict Standards: Non-static method AL_CATEGORY::GetCategoryArray() should not be called statically in /home/software/public_html/guides/admin/includes/classes/class.helper.php on line 82
Deprecated: Function eregi_replace() is deprecated in /home/software/public_html/guides/includes/classes/class.categories.php on line 41
Deprecated: Function eregi() is deprecated in /home/software/public_html/guides/includes/classes/class.article.php on line 273
Deprecated: Non-static method AL_HELPER::ArticleLink() should not be called statically, assuming $this from incompatible context in /home/software/public_html/guides/includes/classes/class.article.php on line 332
Deprecated: Non-static method AL_HELPER::_MakeArticleURLSafe() should not be called statically, assuming $this from incompatible context in /home/software/public_html/guides/admin/includes/classes/class.helper.php on line 453
Deprecated: Non-static method AL_HELPER::_SwapLetters() should not be called statically, assuming $this from incompatible context in /home/software/public_html/guides/admin/includes/classes/class.helper.php on line 419
Deprecated: Function eregi_replace() is deprecated in /home/software/public_html/guides/admin/includes/classes/class.helper.php on line 421
Deprecated: Non-static method AL_HELPER::_MakeArticleURLSafe() should not be called statically, assuming $this from incompatible context in /home/software/public_html/guides/admin/includes/classes/class.helper.php on line 453
Deprecated: Non-static method AL_HELPER::_SwapLetters() should not be called statically, assuming $this from incompatible context in /home/software/public_html/guides/admin/includes/classes/class.helper.php on line 419
Deprecated: Function eregi_replace() is deprecated in /home/software/public_html/guides/admin/includes/classes/class.helper.php on line 421
Deprecated: Function eregi() is deprecated in /home/software/public_html/guides/includes/classes/class.blog.php on line 153
Deprecated: Function eregi() is deprecated in /home/software/public_html/guides/includes/classes/class.author.php on line 139
Deprecated: Function eregi_replace() is deprecated in /home/software/public_html/guides/includes/classes/class.article.php on line 1038
Deprecated: Function eregi_replace() is deprecated in /home/software/public_html/guides/includes/classes/class.article.php on line 1039
Deprecated: Function eregi() is deprecated in /home/software/public_html/guides/includes/classes/class.template.php on line 117
Deprecated: Function ereg_replace() is deprecated in /home/software/public_html/guides/includes/classes/class.template.php on line 243
Deprecated: Function eregi() is deprecated in /home/software/public_html/guides/templates/Bright Light/Panels/PageHeader.php on line 86
Deprecated: Non-static method AL_HELPER::PageLink() should not be called statically, assuming $this from incompatible context in /home/software/public_html/guides/templates/Bright Light/Panels/PageHeader.php on line 95
Deprecated: Non-static method AL_HELPER::_MakeURLSafe() should not be called statically, assuming $this from incompatible context in /home/software/public_html/guides/admin/includes/classes/class.helper.php on line 516
Deprecated: Function eregi() is deprecated in /home/software/public_html/guides/templates/Bright Light/Panels/PageHeader.php on line 86
Deprecated: Non-static method AL_HELPER::PageLink() should not be called statically, assuming $this from incompatible context in /home/software/public_html/guides/templates/Bright Light/Panels/PageHeader.php on line 95
Deprecated: Non-static method AL_HELPER::_MakeURLSafe() should not be called statically, assuming $this from incompatible context in /home/software/public_html/guides/admin/includes/classes/class.helper.php on line 516
Deprecated: Non-static method AL_HELPER::CategoryLink() should not be called statically, assuming $this from incompatible context in /home/software/public_html/guides/templates/Bright Light/Panels/RootArticleCategoriesPanel.php on line 77
Deprecated: Non-static method AL_HELPER::_MakeURLSafe() should not be called statically, assuming $this from incompatible context in /home/software/public_html/guides/admin/includes/classes/class.helper.php on line 604
Deprecated: Non-static method AL_HELPER::CategoryLink() should not be called statically, assuming $this from incompatible context in /home/software/public_html/guides/templates/Bright Light/Panels/RootArticleCategoriesPanel.php on line 77
Deprecated: Non-static method AL_HELPER::_MakeURLSafe() should not be called statically, assuming $this from incompatible context in /home/software/public_html/guides/admin/includes/classes/class.helper.php on line 604
Deprecated: Non-static method AL_HELPER::CategoryLink() should not be called statically, assuming $this from incompatible context in /home/software/public_html/guides/templates/Bright Light/Panels/RootArticleCategoriesPanel.php on line 77
Deprecated: Non-static method AL_HELPER::_MakeURLSafe() should not be called statically, assuming $this from incompatible context in /home/software/public_html/guides/admin/includes/classes/class.helper.php on line 604
Deprecated: Non-static method AL_HELPER::CategoryLink() should not be called statically, assuming $this from incompatible context in /home/software/public_html/guides/templates/Bright Light/Panels/RootArticleCategoriesPanel.php on line 77
Deprecated: Non-static method AL_HELPER::_MakeURLSafe() should not be called statically, assuming $this from incompatible context in /home/software/public_html/guides/admin/includes/classes/class.helper.php on line 604
Deprecated: Non-static method AL_HELPER::CategoryLink() should not be called statically, assuming $this from incompatible context in /home/software/public_html/guides/templates/Bright Light/Panels/RootArticleCategoriesPanel.php on line 77
Deprecated: Non-static method AL_HELPER::_MakeURLSafe() should not be called statically, assuming $this from incompatible context in /home/software/public_html/guides/admin/includes/classes/class.helper.php on line 604
Deprecated: Non-static method AL_HELPER::CategoryLink() should not be called statically, assuming $this from incompatible context in /home/software/public_html/guides/templates/Bright Light/Panels/RootArticleCategoriesPanel.php on line 77
Deprecated: Non-static method AL_HELPER::_MakeURLSafe() should not be called statically, assuming $this from incompatible context in /home/software/public_html/guides/admin/includes/classes/class.helper.php on line 604
Deprecated: Non-static method AL_HELPER::CategoryLink() should not be called statically, assuming $this from incompatible context in /home/software/public_html/guides/templates/Bright Light/Panels/RootArticleCategoriesPanel.php on line 77
Deprecated: Non-static method AL_HELPER::_MakeURLSafe() should not be called statically, assuming $this from incompatible context in /home/software/public_html/guides/admin/includes/classes/class.helper.php on line 604
Deprecated: Non-static method AL_HELPER::CategoryLink() should not be called statically, assuming $this from incompatible context in /home/software/public_html/guides/templates/Bright Light/Panels/RootArticleCategoriesPanel.php on line 77
Deprecated: Non-static method AL_HELPER::_MakeURLSafe() should not be called statically, assuming $this from incompatible context in /home/software/public_html/guides/admin/includes/classes/class.helper.php on line 604
Deprecated: Non-static method AL_HELPER::CategoryLink() should not be called statically, assuming $this from incompatible context in /home/software/public_html/guides/templates/Bright Light/Panels/RootArticleCategoriesPanel.php on line 77
Deprecated: Non-static method AL_HELPER::_MakeURLSafe() should not be called statically, assuming $this from incompatible context in /home/software/public_html/guides/admin/includes/classes/class.helper.php on line 604
Deprecated: Non-static method AL_HELPER::CategoryLink() should not be called statically, assuming $this from incompatible context in /home/software/public_html/guides/templates/Bright Light/Panels/RootArticleCategoriesPanel.php on line 77
Deprecated: Non-static method AL_HELPER::_MakeURLSafe() should not be called statically, assuming $this from incompatible context in /home/software/public_html/guides/admin/includes/classes/class.helper.php on line 604
Deprecated: Non-static method AL_HELPER::CategoryLink() should not be called statically, assuming $this from incompatible context in /home/software/public_html/guides/templates/Bright Light/Panels/RootArticleCategoriesPanel.php on line 77
Deprecated: Non-static method AL_HELPER::_MakeURLSafe() should not be called statically, assuming $this from incompatible context in /home/software/public_html/guides/admin/includes/classes/class.helper.php on line 604
Deprecated: Non-static method AL_HELPER::CategoryLink() should not be called statically, assuming $this from incompatible context in /home/software/public_html/guides/templates/Bright Light/Panels/RootArticleCategoriesPanel.php on line 77
Deprecated: Non-static method AL_HELPER::_MakeURLSafe() should not be called statically, assuming $this from incompatible context in /home/software/public_html/guides/admin/includes/classes/class.helper.php on line 604
Deprecated: Non-static method AL_HELPER::CategoryLink() should not be called statically, assuming $this from incompatible context in /home/software/public_html/guides/templates/Bright Light/Panels/RootArticleCategoriesPanel.php on line 77
Deprecated: Non-static method AL_HELPER::_MakeURLSafe() should not be called statically, assuming $this from incompatible context in /home/software/public_html/guides/admin/includes/classes/class.helper.php on line 604
Deprecated: Non-static method AL_HELPER::CategoryLink() should not be called statically, assuming $this from incompatible context in /home/software/public_html/guides/templates/Bright Light/Panels/RootArticleCategoriesPanel.php on line 77
Deprecated: Non-static method AL_HELPER::_MakeURLSafe() should not be called statically, assuming $this from incompatible context in /home/software/public_html/guides/admin/includes/classes/class.helper.php on line 604
Deprecated: Non-static method AL_HELPER::CategoryLink() should not be called statically, assuming $this from incompatible context in /home/software/public_html/guides/templates/Bright Light/Panels/RootArticleCategoriesPanel.php on line 77
Deprecated: Non-static method AL_HELPER::_MakeURLSafe() should not be called statically, assuming $this from incompatible context in /home/software/public_html/guides/admin/includes/classes/class.helper.php on line 604
Deprecated: Non-static method AL_HELPER::CategoryLink() should not be called statically, assuming $this from incompatible context in /home/software/public_html/guides/templates/Bright Light/Panels/ViewArticlePanel.php on line 732
Deprecated: Non-static method AL_HELPER::_MakeURLSafe() should not be called statically, assuming $this from incompatible context in /home/software/public_html/guides/admin/includes/classes/class.helper.php on line 604
Deprecated: Non-static method AL_HELPER::AuthorLink() should not be called statically, assuming $this from incompatible context in /home/software/public_html/guides/includes/classes/class.article.php on line 522
Deprecated: Non-static method AL_HELPER::_MakeURLSafe() should not be called statically, assuming $this from incompatible context in /home/software/public_html/guides/admin/includes/classes/class.helper.php on line 485
Deprecated: Non-static method AL_HELPER::GetRelativeDate() should not be called statically, assuming $this from incompatible context in /home/software/public_html/guides/includes/classes/class.article.php on line 515
Deprecated: Non-static method AL_HELPER::ShortDate() should not be called statically, assuming $this from incompatible context in /home/software/public_html/guides/admin/includes/classes/class.helper.php on line 282
Deprecated: Non-static method AL_HELPER::GetCategoryListCVS() should not be called statically, assuming $this from incompatible context in /home/software/public_html/guides/templates/Bright Light/Panels/ViewArticlePanel.php on line 77
Deprecated: Non-static method AL_HELPER::CategoryLink() should not be called statically, assuming $this from incompatible context in /home/software/public_html/guides/admin/includes/classes/class.helper.php on line 302
Deprecated: Non-static method AL_HELPER::_MakeURLSafe() should not be called statically, assuming $this from incompatible context in /home/software/public_html/guides/admin/includes/classes/class.helper.php on line 604
Deprecated: Non-static method AL_HELPER::GetRatingBar() should not be called statically, assuming $this from incompatible context in /home/software/public_html/guides/templates/Bright Light/Panels/ViewArticlePanel.php on line 78
Deprecated: Non-static method AL_HELPER::GetGlossaryTerms() should not be called statically, assuming $this from incompatible context in /home/software/public_html/guides/includes/classes/class.article.php on line 637
Deprecated: Function eregi_replace() is deprecated in /home/software/public_html/guides/templates/Bright Light/Panels/ViewArticlePanel.php on line 360
Deprecated: Non-static method AL_HELPER::ContentHasComment() should not be called statically, assuming $this from incompatible context in /home/software/public_html/guides/templates/Bright Light/Panels/ViewArticlePanel.php on line 547
Deprecated: Non-static method AL_HELPER::ArticleLink() should not be called statically, assuming $this from incompatible context in /home/software/public_html/guides/templates/Bright Light/Panels/ArticleOptionsPanel.php on line 60
Deprecated: Non-static method AL_HELPER::_MakeArticleURLSafe() should not be called statically, assuming $this from incompatible context in /home/software/public_html/guides/admin/includes/classes/class.helper.php on line 453
Deprecated: Non-static method AL_HELPER::_SwapLetters() should not be called statically, assuming $this from incompatible context in /home/software/public_html/guides/admin/includes/classes/class.helper.php on line 419
Deprecated: Function eregi_replace() is deprecated in /home/software/public_html/guides/admin/includes/classes/class.helper.php on line 421
Deprecated: Non-static method AL_HELPER::_MakeArticleURLSafe() should not be called statically, assuming $this from incompatible context in /home/software/public_html/guides/admin/includes/classes/class.helper.php on line 453
Deprecated: Non-static method AL_HELPER::_SwapLetters() should not be called statically, assuming $this from incompatible context in /home/software/public_html/guides/admin/includes/classes/class.helper.php on line 419
Deprecated: Function eregi_replace() is deprecated in /home/software/public_html/guides/admin/includes/classes/class.helper.php on line 421
Deprecated: Function eregi_replace() is deprecated in /home/software/public_html/guides/templates/Bright Light/Panels/ArticleOptionsPanel.php on line 60
Deprecated: Non-static method AL_HELPER::ArticleLink() should not be called statically, assuming $this from incompatible context in /home/software/public_html/guides/templates/Bright Light/Panels/ArticleOptionsPanel.php on line 63
Deprecated: Non-static method AL_HELPER::_MakeArticleURLSafe() should not be called statically, assuming $this from incompatible context in /home/software/public_html/guides/admin/includes/classes/class.helper.php on line 453
Deprecated: Non-static method AL_HELPER::_SwapLetters() should not be called statically, assuming $this from incompatible context in /home/software/public_html/guides/admin/includes/classes/class.helper.php on line 419
Deprecated: Function eregi_replace() is deprecated in /home/software/public_html/guides/admin/includes/classes/class.helper.php on line 421
Deprecated: Non-static method AL_HELPER::_MakeArticleURLSafe() should not be called statically, assuming $this from incompatible context in /home/software/public_html/guides/admin/includes/classes/class.helper.php on line 453
Deprecated: Non-static method AL_HELPER::_SwapLetters() should not be called statically, assuming $this from incompatible context in /home/software/public_html/guides/admin/includes/classes/class.helper.php on line 419
Deprecated: Function eregi_replace() is deprecated in /home/software/public_html/guides/admin/includes/classes/class.helper.php on line 421
Deprecated: Function eregi_replace() is deprecated in /home/software/public_html/guides/templates/Bright Light/Panels/ArticleOptionsPanel.php on line 63
Deprecated: Non-static method AL_HELPER::ArticleLink() should not be called statically, assuming $this from incompatible context in /home/software/public_html/guides/templates/Bright Light/Panels/ArticleOptionsPanel.php on line 68
Deprecated: Non-static method AL_HELPER::_MakeArticleURLSafe() should not be called statically, assuming $this from incompatible context in /home/software/public_html/guides/admin/includes/classes/class.helper.php on line 453
Deprecated: Non-static method AL_HELPER::_SwapLetters() should not be called statically, assuming $this from incompatible context in /home/software/public_html/guides/admin/includes/classes/class.helper.php on line 419
Deprecated: Function eregi_replace() is deprecated in /home/software/public_html/guides/admin/includes/classes/class.helper.php on line 421
Deprecated: Non-static method AL_HELPER::_MakeArticleURLSafe() should not be called statically, assuming $this from incompatible context in /home/software/public_html/guides/admin/includes/classes/class.helper.php on line 453
Deprecated: Non-static method AL_HELPER::_SwapLetters() should not be called statically, assuming $this from incompatible context in /home/software/public_html/guides/admin/includes/classes/class.helper.php on line 419
Deprecated: Function eregi_replace() is deprecated in /home/software/public_html/guides/admin/includes/classes/class.helper.php on line 421
Deprecated: Function eregi_replace() is deprecated in /home/software/public_html/guides/templates/Bright Light/Panels/ArticleOptionsPanel.php on line 68
Deprecated: Non-static method AL_HELPER::ArticleLink() should not be called statically, assuming $this from incompatible context in /home/software/public_html/guides/templates/Bright Light/Panels/ArticleOptionsPanel.php on line 81
Deprecated: Non-static method AL_HELPER::_MakeArticleURLSafe() should not be called statically, assuming $this from incompatible context in /home/software/public_html/guides/admin/includes/classes/class.helper.php on line 453
Deprecated: Non-static method AL_HELPER::_SwapLetters() should not be called statically, assuming $this from incompatible context in /home/software/public_html/guides/admin/includes/classes/class.helper.php on line 419
Deprecated: Function eregi_replace() is deprecated in /home/software/public_html/guides/admin/includes/classes/class.helper.php on line 421
Deprecated: Non-static method AL_HELPER::_MakeArticleURLSafe() should not be called statically, assuming $this from incompatible context in /home/software/public_html/guides/admin/includes/classes/class.helper.php on line 453
Deprecated: Non-static method AL_HELPER::_SwapLetters() should not be called statically, assuming $this from incompatible context in /home/software/public_html/guides/admin/includes/classes/class.helper.php on line 419
Deprecated: Function eregi_replace() is deprecated in /home/software/public_html/guides/admin/includes/classes/class.helper.php on line 421
Deprecated: Non-static method AL_HELPER::ArticleLink() should not be called statically, assuming $this from incompatible context in /home/software/public_html/guides/templates/Bright Light/Panels/PopularArticlesPanel.php on line 98
Deprecated: Non-static method AL_HELPER::_MakeArticleURLSafe() should not be called statically, assuming $this from incompatible context in /home/software/public_html/guides/admin/includes/classes/class.helper.php on line 453
Deprecated: Non-static method AL_HELPER::_SwapLetters() should not be called statically, assuming $this from incompatible context in /home/software/public_html/guides/admin/includes/classes/class.helper.php on line 419
Deprecated: Function eregi_replace() is deprecated in /home/software/public_html/guides/admin/includes/classes/class.helper.php on line 421
Deprecated: Non-static method AL_HELPER::_MakeArticleURLSafe() should not be called statically, assuming $this from incompatible context in /home/software/public_html/guides/admin/includes/classes/class.helper.php on line 453
Deprecated: Non-static method AL_HELPER::_SwapLetters() should not be called statically, assuming $this from incompatible context in /home/software/public_html/guides/admin/includes/classes/class.helper.php on line 419
Deprecated: Function eregi_replace() is deprecated in /home/software/public_html/guides/admin/includes/classes/class.helper.php on line 421
Deprecated: Non-static method AL_HELPER::ArticleLink() should not be called statically, assuming $this from incompatible context in /home/software/public_html/guides/templates/Bright Light/Panels/PopularArticlesPanel.php on line 98
Deprecated: Non-static method AL_HELPER::_MakeArticleURLSafe() should not be called statically, assuming $this from incompatible context in /home/software/public_html/guides/admin/includes/classes/class.helper.php on line 453
Deprecated: Non-static method AL_HELPER::_SwapLetters() should not be called statically, assuming $this from incompatible context in /home/software/public_html/guides/admin/includes/classes/class.helper.php on line 419
Deprecated: Function eregi_replace() is deprecated in /home/software/public_html/guides/admin/includes/classes/class.helper.php on line 421
Deprecated: Non-static method AL_HELPER::_MakeArticleURLSafe() should not be called statically, assuming $this from incompatible context in /home/software/public_html/guides/admin/includes/classes/class.helper.php on line 453
Deprecated: Non-static method AL_HELPER::_SwapLetters() should not be called statically, assuming $this from incompatible context in /home/software/public_html/guides/admin/includes/classes/class.helper.php on line 419
Deprecated: Function eregi_replace() is deprecated in /home/software/public_html/guides/admin/includes/classes/class.helper.php on line 421
Deprecated: Non-static method AL_HELPER::ArticleLink() should not be called statically, assuming $this from incompatible context in /home/software/public_html/guides/templates/Bright Light/Panels/PopularArticlesPanel.php on line 98
Deprecated: Non-static method AL_HELPER::_MakeArticleURLSafe() should not be called statically, assuming $this from incompatible context in /home/software/public_html/guides/admin/includes/classes/class.helper.php on line 453
Deprecated: Non-static method AL_HELPER::_SwapLetters() should not be called statically, assuming $this from incompatible context in /home/software/public_html/guides/admin/includes/classes/class.helper.php on line 419
Deprecated: Function eregi_replace() is deprecated in /home/software/public_html/guides/admin/includes/classes/class.helper.php on line 421
Deprecated: Non-static method AL_HELPER::_MakeArticleURLSafe() should not be called statically, assuming $this from incompatible context in /home/software/public_html/guides/admin/includes/classes/class.helper.php on line 453
Deprecated: Non-static method AL_HELPER::_SwapLetters() should not be called statically, assuming $this from incompatible context in /home/software/public_html/guides/admin/includes/classes/class.helper.php on line 419
Deprecated: Function eregi_replace() is deprecated in /home/software/public_html/guides/admin/includes/classes/class.helper.php on line 421
Deprecated: Non-static method AL_HELPER::ArticleLink() should not be called statically, assuming $this from incompatible context in /home/software/public_html/guides/templates/Bright Light/Panels/PopularArticlesPanel.php on line 98
Deprecated: Non-static method AL_HELPER::_MakeArticleURLSafe() should not be called statically, assuming $this from incompatible context in /home/software/public_html/guides/admin/includes/classes/class.helper.php on line 453
Deprecated: Non-static method AL_HELPER::_SwapLetters() should not be called statically, assuming $this from incompatible context in /home/software/public_html/guides/admin/includes/classes/class.helper.php on line 419
Deprecated: Function eregi_replace() is deprecated in /home/software/public_html/guides/admin/includes/classes/class.helper.php on line 421
Deprecated: Non-static method AL_HELPER::_MakeArticleURLSafe() should not be called statically, assuming $this from incompatible context in /home/software/public_html/guides/admin/includes/classes/class.helper.php on line 453
Deprecated: Non-static method AL_HELPER::_SwapLetters() should not be called statically, assuming $this from incompatible context in /home/software/public_html/guides/admin/includes/classes/class.helper.php on line 419
Deprecated: Function eregi_replace() is deprecated in /home/software/public_html/guides/admin/includes/classes/class.helper.php on line 421
Deprecated: Non-static method AL_HELPER::ArticleLink() should not be called statically, assuming $this from incompatible context in /home/software/public_html/guides/templates/Bright Light/Panels/PopularArticlesPanel.php on line 98
Deprecated: Non-static method AL_HELPER::_MakeArticleURLSafe() should not be called statically, assuming $this from incompatible context in /home/software/public_html/guides/admin/includes/classes/class.helper.php on line 453
Deprecated: Non-static method AL_HELPER::_SwapLetters() should not be called statically, assuming $this from incompatible context in /home/software/public_html/guides/admin/includes/classes/class.helper.php on line 419
Deprecated: Function eregi_replace() is deprecated in /home/software/public_html/guides/admin/includes/classes/class.helper.php on line 421
Deprecated: Non-static method AL_HELPER::_MakeArticleURLSafe() should not be called statically, assuming $this from incompatible context in /home/software/public_html/guides/admin/includes/classes/class.helper.php on line 453
Deprecated: Non-static method AL_HELPER::_SwapLetters() should not be called statically, assuming $this from incompatible context in /home/software/public_html/guides/admin/includes/classes/class.helper.php on line 419
Deprecated: Function eregi_replace() is deprecated in /home/software/public_html/guides/admin/includes/classes/class.helper.php on line 421
Deprecated: Non-static method AL_HELPER::AuthorLink() should not be called statically, assuming $this from incompatible context in /home/software/public_html/guides/templates/Bright Light/Panels/PopularAuthorsPanel.php on line 79
Deprecated: Non-static method AL_HELPER::_MakeURLSafe() should not be called statically, assuming $this from incompatible context in /home/software/public_html/guides/admin/includes/classes/class.helper.php on line 485 What is CDMA?
Code Division Multiple Access is an alternative technology to GSM for 2G and 3G networks. In CDMA, voice signals are digitised, and the frequency of the transmitted signal is varied according to a predefined code. This signal can only be intercepted by a receiver whose frequency response is programmed to vary with the same code. Since there are trillions of frequency-shifting sequences, CDMA signals offer considerable privacy. These signals use the 800 MHz and 1.9 GHz bands. CDMA signals utilise more bandwidth compared to GSM signals because of the variations in frequency. CDMA handsets are typically locked by carriers, which means you cannot switch your carrier without changing your handset.