There's been a lot of back and forth about the specs of the Nexus 4 being sold by T-Mobile. We already gone over one hurdle confirming that all Nexus 4's are HSPA+ 42, and now we're going to clear the air on Wifi Calling. We've been saying since the end of October that Wifi Calling will not be included, and we're happy to report that we can confirm this independently. We've reached out to T-Mobile directly, and a spokesperson has confirmed for us that indeed there is no Wifi Calling on-board on the Nexus 4.
Let's all reflect on the fact that this is actually a good thing. Not having carrier software included on the Nexus 4 coming from T-Mobile reaffirms the idea that this is the exact same model being sold by Google in the Play Store. Users who buy their phones from a carrier shouldn't have to be second class citizens to those who buy directly. This is a good move by Google (and T-Mobile) and it will save a lot of frustration down the road when it comes to software support.
More: Google Nexus 4 Forums