iPhone 4′s HSUPA Support Increases Upload Speeds Significantly
We’re getting emails and comments from our readers who have been playing around with their shiny new iPhone 4 to give us their valuable feedback.
Many of them are complaining about the widely publicized iPhone 4 reception issues, which is now infamously called the iPhone 4 Death Grip.
However, some readers are also telling us that they’re seeing significant improvement in upload speeds as compared to their older iPhone.
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.
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.
Folks at Gizmodo carried out speed tests with an iPhone 3GS and iPhone 4 across several locations in New York City and observed that the download speeds were similar, ranging from 0.5 to 2 Mbps on both iPhones while iPhone 4 was significantly faster in the upload speeds tests. iPhone 3GS (without HUSPA support) could upload files at around 0.1 Mbps while iPhone 4 was able to upload files between 0.6 to 1.4 Mbps.
Let us know if you're also observing significant increase in upload speeds on your iPhone 4 in the comments.