3.5G, or HSDPA, is available in the United States (AT&T, soon T-Mobile), Canada (Rogers), Europe (most carriers), Japan (NTT DoCoMo), Korea (KTF), etc. 3.75G, or HSUPA/HSPA, is available in the United States (AT&T), Europe (Vodafone, Movistar, T-Mobile in some areas, etc), Korea (KTF), etc.
HSPA+ is currently in design phase and should likely start rolling out in the next couple years. Expect early adoption from Korea, with Europe to follow. The main improvement of HSPA+ over HSPA is faster speeds in downstream and upstream. I don't expect AT&T to offer this technology anytime soon, as they are still b*tching about offering HSDPA and it's slower Gen1 speeds.
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