1. johncampanale's Avatar
    Does the prepaid 640 come with the Wi-Fi Calling? Is it able to be used with the post-paid SIM. I see that the SIM works without problems, but does the WI-FI calling work post-paid SIM's as well.

    06-22-2015 05:46 PM
  2. anon(9435020)'s Avatar
    From what I understand, yes, if it is on T-mobile.
    06-22-2015 06:11 PM
  3. libra89's Avatar
    Yes it does, the setting is just slightly different (and kind of hidden).
    I am a postpaid T-mo customer and just slipped in the sim just fine. I saw that in my account that T-mo updated to show that I am using the Lumia 640.
    06-22-2015 07:16 PM
  4. Dub-J's Avatar
    I can also confirm that both Wi-Fi calling and a post-paid TMO SIM work fine with the 640.

    My Wi-FI calling was automatically enabled when I popped my SIM in, but if you need to get to it, it is under "Cellular+SIM" under the SIM settings. You can also set your calling preference there (default is Wi-Fi preferred).
    Last edited by Dub-J; 06-22-2015 at 11:27 PM.
    metalchick719 likes this.
    06-22-2015 08:57 PM
  5. TwoBitWhackJob's Avatar
    Ditto what Dub said. Popped in the post-paid SIM, started it up no problems authenticating, and WiFi was enabled.
    06-23-2015 11:23 AM
  6. Guy Krause's Avatar
    I have a T-Mobile Microsoft Lumina 640 and WiFi calling does NOT work. I see the little phone symbol next to the WiFi icon intermittently but only when I also have one bar of 4G. With no cellular signal at all, the display is just plain "No Service". If I switch from WiFi Preferred to WiFi only, then the airplane mode icon appears and again the display is just "No Service" without the phone symbol attached to the WiFi icon.
    07-09-2015 09:43 PM

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