Xperia 1 not working VoLTE

[Vladimir75]

4G+ network Megafon Moscow. VoLTE support  enabled on tariff SIM card and operator Megafon. When calling 4G+ drop to H+ or 3G network. Samsung S8 no problems with this SIM, VoLTE work stable. 

[NunoSEN2]

Hi @Vladimir75 ;

Have you read this: https://support.sonymobile.com/global-en/xperia1/faq/how-do-i/801930740589c9bb60165c3d94d12006cd2/

[yzymanayzy]

Try rebooting. I met once, recovered after rebooting.

[Lord_viridis]

Is there not a setting in:

Settings > Network & internet > Mobile network > Advanced > Enable VoLTE

[RottenFoxBreath]

That only appears if you have gotten a branded phone from an operator like o2, etc..

Otherwise, stock sim free doesn't allow the selection.

The phone has to have the branded operator software installed, to allow it.

o2 have had the "we'll add more premium non branded o2 phones when and if" disclaimer up on their site for an age now, and yet still nothing, even with paying for a top dollar contract. 

You'll just get HD voice, which improves the quality, o2 to o2/giffgaff calls are clear as a bell, and calls to my work from o2 to vodaphone are crystal clear too, un the UK.

But calling my work mobile, an old 3G handset, you can hear the difference, so 4G to 4G is great, but anything else, like a poor network, or foreign network not up to the task, voLTE is going to be needed.

[Alecmag]

Tele2 Moscow VoLTE does not work. Make support at last. Why do Chinese phones have Tele2 VoLTE support and you don’t.

[RottenFoxBreath]

It's up to the network provider, not Sony.

[Alecmag]

VoLTE depends not only on the mobile operator. Until Sony adds the profile to the phone’s settings, VoLTE will not work. The operator can at least do something. But it won’t work.

[RottenFoxBreath]

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@Alecmag wrote:

VoLTE depends not only on the mobile operator. Until Sony adds the profile to the phone’s settings, VoLTE will not work. The operator can at least do something. But it won’t work.

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Hmmm...If you check out the facts, Google handed all that over to the network providers(in the process in some locales), so if you buy a sim free phone, on a contract, you don't get it.

If you buy the same phone from same network, but for example, branded from the network operator(not even physically, but if it has an o2/virgin/Vodaphone logo on boot), on pay monthly or pay as you go, you get voLTE, as you need network modified OS  for it work.

o2 on their website, are very clear on the matter, and explain it as I have above.