The Boy Genius Report just made an extremely short (2 sentences short) posting claiming they have received word that T-Mobile will begin testing UMA calling on their Android phones sometime in Q3 this year. If you have or had a BlackBerry through T-Mo, you may be familiar with the feature that allows you to make voice calls over your home’s Wi-Fi network rather than the carriers network. From what I have read, UMA on the BlackBerry could be shoddy unless you purchase T-Mo’s official Linksys router.
Again, they said TESTING and Q3, which to me sounds like they won’t even get around to seeing if the feature is viable until much later in the year. Sounds like a great option for those that live in areas with less-than-stellar reception.