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 detail that we overlooked in AT&T's wording. It reported "9.4 million smartphone sales" but "7.6 million iPhone activations" (emphasis mine). So, consider
