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Joined on: January 9, 2017
User's Score: 163
Axon 10 Pro
Blade A7 Prime
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A2017U on Android 7.1.1 stock rom
I haven't gone with Lineage just yet, Audio is still a deal breaker for me. And I actually like what small changes ZTE has made to their UI. Still waiting for a solution, I shouldn't have to flash a custom rom for a feature that's meant to work on the stock rom.
glad those guides help you in anyway , and about your VoLTE issue , this is probably cause by the A2017U software is base for USA ONLY CARRIERS and doesn't apply oversea.
My only suggestion and hopping you are confident doing it is, Flash the A2017G Software and give that a shot.
Regarding the APN Settings i haven't done anything just i have set the APN name as jionet and rest of the fields left as is... I even got the response in the XDA Developers portal saying that even he has the US Model and even his mobile also started supporting VoLTE.