AT&T today took issue with some of T-Mobile's HSPA+ claims. The carrier not only noted that its now launching network has a peak of 21Mbps, not the 14.4Mbps argued by T-Mobile. It likewise disagreed with T-Mobile's insistence that its network was the largest, since AT&T's HSPA+ was potentially reachable by 180 million users today versus T-Mobile's 140 million.
