iPhone 4S wood backAT&T just reported the wireless carrier had its best-ever quarter to end 2011. This was the same quarter the company had to dish out an insane $4.2 billion in charges because of its failed T-Mobile acquisition. But Ma Bell didn’t let that minor set back get them down, instead posting a record 9.4 million smartphones sold during Q4, jumping nearly double over the previous quarter. What’s most astonishing about that figure, though, is the iPhone accounted for 7.6 million of those sales, with the majority of customers opting for the iPhone 4S. The iPhone 4S didn’t even go on sale until two weeks into AT&T’s quarter, either.

If we remember back to Apple’s recent Q4 earnings report, the Cupertino-based company said it pushed a whopping 37.04 million iPhone units out the door, a 128 percent increase year-over-year. Divide that by Ma Bell’s 7.6 million, and that comes out to 20 percent of Apple’s overall iPhone sales in the three months ending 2011, most of which were scooped up by existing AT&T customers. The rest of the AT&T pie was split between Android, Windows Phone and BlackBerry.

With reports saying Apple is readying production for the iPhone’s next iteration, well, one can only expect carriers like AT&T to post even better numbers once the device finally hits.

[via AllThingsD]