I have HTC U11 CID 034, stock rom and my carrier support VoLTE and WIFI calling. Because I have unbranded phone I cannot turn on this functions. Today I found out how to enable this and it works. Everything is easy and it took less than 5 minutes to activate it. Your carrier must support this features and need to activate VoLTE and WIFI calling for you.
All credits goes to LlabTooFeR, and you need do what he wrote in comments below post...
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All credits goes to LlabTooFeR, and you need do what he wrote in comments below post...
Read more