So I wanted to update the thread:
I still have VoLTE, to do some testing on weather it is tied to iPhone only I put the same sim into a ZTE Blade Spark which is a AT&T branded Android phone and is VoLTE ready and I noticed VoLTE also works on the Blade spark as well. So it seems as long as AT&T has whitelisted the imei in the system that provisions VoLTE and your device is VoLTE ready you can move devices and it stays activated but if you move it to an unlocked phone that is not whitelisted you could lose it one the system does a “imei check” and sees the incompatible device.
Home Entertainment: Xfinity Double Play with 140+ channels and 100 Megs per second internet.
Landline: Google Voice
Mobile Entertainment: AT&T Prepaid as primary, Three UK sim as secondary.
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