Hello there!
So I've been watching this forum for a solution a long time ago now and I've seen that there's a plenty of you, who didn't find any solution just like me. Because I didn't want to ruin my phone with unlocking and root. But I managed to make it work, not just volte, but vowifi too. All you need is another phone that works on VoLTE (and/or vowifi) in the same country ( same carrier is better bu not requirement). Put your SIM card in that phone, enable VoLTE (and VoWifi) and put it back in your Xperia. For me, it worked with a T-mobile HU SIM card (They don't even have on sell this phone ). It was in my iPhone 8 plus, it had working VoLTE and VoWifi. When I put it in my Xperia both options popped up in the settings and they both worked like a charm. My perso SIM is a Yettel HU one (I bought the Xperia from them), it isn't VoLTE enabled by carrier, so I'll contact them today about it.
Hope, you guys manage to make them work too
So I've been watching this forum for a solution a long time ago now and I've seen that there's a plenty of you, who didn't find any solution just like me. Because I didn't want to ruin my phone with unlocking and root. But I managed to make it work, not just volte, but vowifi too. All you need is another phone that works on VoLTE (and/or vowifi) in the same country ( same carrier is better bu not requirement). Put your SIM card in that phone, enable VoLTE (and VoWifi) and put it back in your Xperia. For me, it worked with a T-mobile HU SIM card (They don't even have on sell this phone ). It was in my iPhone 8 plus, it had working VoLTE and VoWifi. When I put it in my Xperia both options popped up in the settings and they both worked like a charm. My perso SIM is a Yettel HU one (I bought the Xperia from them), it isn't VoLTE enabled by carrier, so I'll contact them today about it.
Hope, you guys manage to make them work too