[Q] WIFI calling with play store version or just Tmobile version???

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http://forum.xda-developers.com – Hello all. I am really looking forward to the new Nexus 4 as is everyone else :laugh:. The only question I have, and it's a biggie for me, will there be a wifi calling app for the play store version of the phone. I assume that there will be one for the Tmobile store bought version, but where I live I get little to no cell service. I use the wifi calling anytime I am at the house therefore I need it. I would like to buy the phone from the play store because my contract isn't up soon. If not is it possible that an apk could be made to just flash into the phone's software? Maybe I'm just rambling (HowTos)