1. Chad Mcauliffe's Avatar
    Does it have wifi calling? Where do I turn wifi calling on? I have a lumia 640 on tmobile and had wifi calling prior to installing the tech preview last night. I might have to roll back because I don't get service at my house. bummer! Sorry if this is a duplicate post I could find the answer anywhere. Thanks guys!!
    07-13-2015 08:20 PM
  2. netmann's Avatar
    You must have uninstalled it before upgrading to 10166. Go to Store and download the App again.
    07-13-2015 10:38 PM
  3. Carl Anderson's Avatar
    I don't have it either after going to 10166 on my T-Mo 640.

    I checked Settings -> Network and Wireless -> Cellular & SIM -> SIM Properties (you have to select the SIM, and then properties will show up) and noticed my IMS connection is now unregistered.
    07-14-2015 09:35 AM

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