S20 Ultra SM-G988U Advance Calling Option

[Jass_232]

Hello,

Im looking for someone who can help me with my very special circumstances. I have a S20 Ultra from Verizon, im using this phone outside US and am facing issue activating HD Calling ( VoLTE ), tried all options in hand but no luck. When i select the advancd option in setting it takes me to Verizon app then it gives an error "attached". Note : its snapdragon and i dont wanna go for rooting as no need.

Thanks in advance

 

[jhr5474]

refer to forum rules, this is not a section for questions.