HSPA + has been officially certified by the international cell phone commission as being 4G. It's just technology than WiMax, which Sprint uses and LTE, which Verizon uses and AT&T also uses.
Verizon's EVDO was just an enhanced version of 2G, 2.5G actually, but nobody challenged it as being 3G did they even though it was never certified as being a 3G technolgy?
while this is true, even at&t themselves stated that hspa+ was not 4g, when t-mobile advertised it as such. months later, of course, at&t said it was 4g, only after they wanted to market it as such. potAtoes, potOtoes i suppose.
Some of the features that differ between carriers are due to network differences. Like the AT&T iPhone being able to do voice and data simultaneously while the Verizon and Sprint versions do not.
Also, while the ITE confirmed HSPA+ as "4G", no one's current 4G offerings fit the original definition of 4G (which would keep pace with DOCSIS 3 and Fiber home internet connections. LTE is the only technology that will make the switch to the original definition of 4G without leaving older LTE devices to rot and making newer devices suffer as older devices are retired, while HSPA+'s crossover to the original definition of 4G will be hampered by the plethora of current HSPA+ devices that won't support faster speeds, similar to how an 802.11n network is slowed by A, B, and G devices.
And AT&T's HSPA+ is still slower, in an overall sense, than the "slow" Verizon 3G network.
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