No reception in apartment, iphone app for making calls and texting through wi-fi?

I've got an iphone 5 with t-mobile, the apartment i live in gives me literally no reception at all. But as soon as i step out of it, i get an immidiate 3-4 bars, so I figured it's just my apartment. Does anyone know of any iphone apps that can use my phone number to make calls and text through wi-fi while still allowing me to keep my t- mobile service? So that i can still get calls and texts while in my apartment?

As of right now; no. You could probably use some various VOIP apps like Skype or something. But you'd have to purchase a second number. Sadly, they have no plans on bringing their Wi-Fi calling feature to the iPhone.

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