the speediest with an average time of 5.8 months with Sprint coming in second with an average 6.5 months before update. Coming in third was AT&T which took an average of 7.8 months to update an Android model. And last, with an average of 8 months, is Verizon. Actually, that is no surprise as many of Big Red's customers have bitched about the slow updating at the nation's largest carrier. A case in point, look at the Samsung Galaxy S III's update to Android 4.1. Sprint was the first with the update in late October followed by T-Mobile which rolled out the update in mid November. In early December, AT&T subscribers had to pull the update out of Kies. Last Friday, Verizon started disseminating the update at last.
It's a no-brainer, but we should point out that if speedy updates are your thing, then the stock Android Nexus will always be the answer. On Sprint and Verizon, the Samsung GALAXY Nexus updated in only 2.5 months.
source: ArsTechnica via BGR