The iPhone 3GS supports 7.2Mbps connectivity; however, these kind of speeds won’t be obtained if you are trying to upload, according to a MacWorld report.

When the iPhone 3GS arrived last month, I explained the ins and outs of High Speed Packet Access (HSPA), the rubric that covers AT&T’s two highest-speed cellular data standards: HSDPA for downstream and HSUPA for upstream. It turns out that the iPhone 3GS is more limited than what I outlined in that article.

On the downstream side, all is well. The iPhone 3G handles up to 3.6 Mbps HSDPA, and the 3GS can use the newer 7.2 Mbps HSDPA flavor. AT&T is building out the 7.2 Mbps service, which will start being available in some metropolitan areas later this year.

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