
In addition to its oddly secret 512MB of RAM, iPhone 4 also packs another important feature Steve Jobs gave only brief mention of during his introductory keynote at WWDC: support for High-Speed Uplink Packet Access (HSUPA).
HSUPA (also known as Enhanced Uplink) is a 3G protocol that provides uplink speeds up to 5.76 Mbps in the Category 6 flavor supported by iPhone 4. It joins HSDPA (High-Speed Download Packet Access), the enhanced download upgrade to UMTS 3G service that was supported by last year’s iPhone 3GS, enabling up to 7.2 Mbps downloads. Because it lacked support for HSUPA, iPhone 3GS was limited to just 384 kbps uploads. Read more…





