1. Windows Central Question's Avatar
    My T-Mobile 640 Go Phone could be switched to wifi calling but I cannot figure out how to accomplish this with the AT&T 640 XL versions so I thought it best to ask if the phone was even capable.
    01-22-2016 01:41 PM
  2. libra89's Avatar
    I haven't heard anything about the AT&T 640 xl being able to make wifi calls, so I doubt it. The T-mobile variant has wifi calling as part of the firmware.
    01-22-2016 07:27 PM

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