ComputerWorld has published a study that sheds some light on which manufacturer and wireless carrier in the U.S. provide Android users with operating system updates in the most timely fashion. Data was collected on handsets released by AT&T, Sprint, T-Mobile, and Verizon from 2009 through 2010. The report examines how many phones were upgraded to Froyo (Android 2.2), how many days it took to receive this upgrade, and what percentage devices are still waiting. The study indicates that HTC has delivered the most Android 2.2 updates to its handsets (50%) while Motorola updates its devices the fastest (54.5 days after 2.2 announcement). In terms of carriers, Verizon took the top spot — taking just 58 days on average to push out 2.2 updates — and was followed by Sprint, T-Mobile, and AT&T respectively. The report notes, “Between June and December, AT&T failed to upgrade a single one of its nine Android phones.” Ouch. What do you think? Any surprises here?