High Speed Packet Access is based on the UMTS protocol. It is divided into two standards: HSDPA (HS Downlink PA) and HSUPA (HS Uplink PA). HSDPA is also known as “3.5G” and has theoretical data transfer rates of 8 ~ 10 Megabits per second. Multimedia and streaming video is the primary focus of HSDPA networks. Most new high-end phones come with HSDPA services enabled, though very few carriers support these high speeds.