Enable VoLTE on unlocked AT&T Lumia 640 - 1073

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Sep 17, 2015
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Hey guys,
I recently bought AT&T phone from Microsoft Store and got it unlocked. (side note: AT&T was unable to unlock the phone bought through Best Buy).

I am using the phone on T-Mobile and have a Cell Spot booster to boost LTE signal in my house. While I can surf the Internet at good speeds, voice does not work as the firmware does not have wi-fi calling or VoLTE enabled.

Since I haven't seen any success stories of de-branding the phone with Windows 10.0.10586.11, I was wondering if there is registry hack to enable wifi-calling or VoLTE while still on AT&T firmware.

Thanks
 

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