zacharye writes in with a story about Senior EVP of AT&T technology and network operations John Donovan's blog post detailing why customers with unlimited smartphone plans are getting throttled. "In an effort to justify its policies surrounding data service throttling for subscribers with unlimited smartphone data plans, AT&T on Tuesday issued a brief report regarding data usage on its nationwide wireless network. Senior EVP of AT&T technology and network operations John Donovan wrote on a company blog that data traffic on AT&T's network has grown a staggering 20,000% over the past five years. Usage has doubled between 2010 and 2011 according to the executive, due in large part to the proliferation of smartphones. AT&T sold more smartphones in the fourth quarter of 2011 than in any other quarter in its history. And because its smartphone subscribers use so much data, AT&T seems to suggest it has no choice but to put measures such as data throttling in place."