Wifi Calling App for Non-branded T-Mobile Devices (BYOD)

    My wife and I just switched to T-Mobile last month. So far there has been a few areas where we just do not have any signal and we are questioning our decision to go with T-Mobile. Anyway, I began researching this and discovered T-Mobile has the wifi calling application. Our problem is we joined T-Mobile with the  BYOD (Samsung S5 & Nokia Lumia 820) option. We really do not want to have to purchase T-Mobile branded devices. Is it possible to download the wifi calling application since I am a T-Mobile customer? If so where can I get the application? 

    Thanks in advance,

    Micky

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