AT&T's iPhone "sales" versus "activations": Doing the Math

love Apple gear? Like math? TUAW’s Doing the Math series examines the numbers and the science behind the hardware and software. several sites — including TUAW — reported yesterday that 80% of all smartphones AT&T sold in Q411 were iPhones, based on AT&T’s quarterly earnings report. On closer inspection, however, there’s a subtle but important …