Does AT&T Have WiFi Calling?

Why didn't AT&T provide WiFi like T-Mobile with their Android phones?  We have started hearing some positive reviews from T-Mobile customers who are using their new UMA WiFi calling app from Kineto on Android phones.  We were wondering if AT&T, Verizon & Sprint plan to follow T-Mobile's lead and offer a similar product?  Android smartphone connected to a Wifi network have the option of  making calls through WiFi once it is registered on the network.  The phone seems to minimize the signal from HSPA+ or Edge to reduce interference & is designed to be used in locations where you don't have any signal like indoors.

When T-Mobile indicated they were not taking a femtocell strategy last year and said they were focusing on WiFi for offloading and in dead zones I was initial skeptical.  But now I am not because the product works great and is very disruptive to a number of other telecom businesses that help with cell coverage.  Its not likely you will see Verizon, Sprint or AT&T following in T-Mobile's footsteps and actually do what is right for the consumer.  However, I hope I am wrong.  Why would you want to give your customers a product that is free?  Wouldn't it disrupt their profit center femtocell business AT&T Microcell, Verizon femtocell & Sprint femtocell sales.

Here is a review that explains the T-Mobile application that is NOT available currently in the Android marketplace.