HSDPA, HSUPA, HSPA+, and iPhone 5
As I understand it, we have
HSDPA/HSUPA (HSPA for short) capability with the
iPhone 4 and
3GS right now. The speed tops out at
7.2 mb/s.
HSPA+ is what T-Mobile is promoting right now as their "fake" 4G. It's not really 4th generation technology, but a tweaking of the current 3rd generation infrastructure to push incredibly higher speeds (upwards of 21 mb/s).
AT&T plans on rolling out their LTE (Long-Term Evolution) network in 2012. It is a true 4th-generation infrastructure. Verizon will have their LTE network up and running before AT&T, apparently this year (2011). T-Mobile does not have an LTE plan for 2012 as far as I know. Sprint rolled out their "4G" WiMax last summer with the Evo 4G, but if I am not mistaken, they scrapped their plans to develop the network, and will instead lease 4G service from either Verizon or AT&T's LTE network and mark up the subscription price $10 and pass that on to their customers. There are several class-action lawsuits popping up all over the country against Sprint from customers who were promised 4G service, and PAYING for 4G service when the 4G was not (and will not be) available.
But I digress... since T-Mobile started promoting their "fake" 4G service, I think AT&T decided that they would need to do the same to stay competitive. They rolled out an advertisement in January on the website that spoke of a transition plan to LTE. It started with current improved 3G speeds, then HSPA+, and finally LTE. You can see the advertisement
here.
My best guess is that the iPhone 5 will be HSPA+ capable, and will push the 20 mb/s or faster speeds. In 2012, it will take an entirely new iPhone device to run on the LTE network for true 4G speeds. I don't think they will name the summer 2011 iPhone a "4G", because this may not leave a naming option for the device when it truly becomes an LTE 4G phone. I'm betting on iPhone 5, and creating a needed separation between the generation of the iPhone and anything to do with network speeds.
Your thoughts? Corrections? New information? Chat me up!