T-Mobile has begun rolling out a much anticipated update to their recently launched G2 handset today. Marked as version 1.22.531.8, the update brings a few changes to the device, most notably the ability to make and receive calls over WiFi. Other details include improved data connection reliability, optimized radio recovery, and a fix for freezing and powering off issues. The update will automatically notify you once you can grab it. In the meanwhile, going to Menu>Settings>About phone>System might jump start things a bit.