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Here's a nice surprise, that was scantily touched upon by Steve Jobs during the official unveiling of the iPhone 4: Apple's latest handset supports HSUPA (High Speed Uplink Packet Access,) a 3G protocol that provides uplink speeds up to 5.76 Mbps. According to AppleInsider, the iPhone 4's HSUPA "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."
"Support for both HSDPA and HSUPA in iPhone 4 makes the phone a '3.5G' device and means it can theoretically achieve 7.2 Mbps downloads and 5.8 Mbps uploads, but those capabilities are also dependent upon the mobile operator."
Allow us to translate: The iPhone 4 uploads really fast.
The folks over at Gizmodo put the iPhone 4 through its paces yesterday and found that the latest version of the smartphone boasted upload speeds that were 5-10 times faster than those seen with the iPhone 3GS. The website is quick to note however, that their speed tests were conducted with the phone resting on a flat surface, and didn't take the iPhone 4's reported antenna/hand positioning issues into account.