They’re not billing it as a 4G network (like T-Mobile for example), but AT&T says that their network is now 80% HSPA+. For the acronym challenged, HSPA+ (or Evolved HSPA) increases the theoretical peak data rate from HSPA’s 14 Mbit/s to 56 Mbit/s (per Wikipedia).
The caveat here is that AT&T doesn’t currently have any phones that support the speeds that would benefit from HSPA+, and the only phones on T-Mobile run Android. But still, network upgrades benefit everyone.
via: Boy Genius Report