VoLTE / 4G calling not available (Sony Xperia 1ii)

[line-wait]

I recently joined O2 from Three, because Three are turning off their 3g network and I stopped being able to make any calls. I have a Sony Xperia 1ii which I believe is capable of 4G calling but this did not work on Three's network. Three has no 2G to fall back on.

On O2 I can use my phone again, because O2 are yet to turn off 3G. However, I would like to know that my phone still will, once this happens.

There are no options in my phone settings that allow me to enable/disable 4G calling.

I just spoke to O2's technical support. They told me to look through the settings which (as I already knew) revealed there was nothing I could turn on or off.

The advisor then asked me if I could access mobile internet whilst on the call with him. I could. He said this meant that my phone was already using 4G calling. I pointed out that while on the call, the symbol in the top menu bar is "H+" not 4G, suggesting the call was going through an H+ connection not a 4G one.

He assured me that no, that doesn't matter; if I can use mobile internet whilst on a call, this means my phone is using 4G calling. I was sceptical but said ok and ended the call.

However ... if I change my "Preferred network type" to "4G/5G" I am unable to make any calls.

Does this not confirm that I'm correct - my phone is not making 4G calls?

(I have tried doing the *#*#4636#*#* code and there is a switch next to "VoLTE provisioned" but it's turned off and greyed out.)

[japitts]

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@line-wait wrote:

The advisor then asked me if I could access mobile internet whilst on the call with him. I could. He said this meant that my phone was already using 4G calling. I pointed out that while on the call, the symbol in the top menu bar is "H+" not 4G, suggesting the call was going through an H+ connection not a 4G one.

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H & H+ are 3G indicators.

[madasaf1sh]

This is all linked to the Sony firmware flashed onto the phone for Three, which seems to have disabled VoLTE..

 Not sure if this is you @line-wait  asking on the Three community, but they seem to confirm it.. https://community.three.co.uk/t5/Devices/Xperia-1-ii-not-making-it-recieving-calls/m-p/38256 

I would contact Sony to be honest, and see what they can advise.. There may be ways to flash a none Three firmware onto the phone at your own risk, and you will need to completely wipe the phone..

[MI5]

But it's an O2 phone.....

[madasaf1sh]

The Op says he joined from 3 with the same handset which didn't work on 3 with VOLTE

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@line-wait wrote:

I recently joined O2 from Three, because Three are turning off their 3g network and I stopped being able to make any calls. I have a Sony Xperia 1ii which I believe is capable of 4G calling but this did not work on Three's network. Three has no 2G to fall back on.

On O2 I can use my phone again, because O2 are yet to turn off 3G. However, I would like to know that my phone still will, once this happens.

There are no options in my phone settings that allow me to enable/disable 4G calling.

[MI5]

My handset, the Sony Xperia 1ii is one that was sold by O2 (even though that's not where I originally bought mine).

[Enlli]

Customer could well mean it's a model sold by O2  

Phrasing is ambiguous 

[madasaf1sh]

To me that's not an o2 supplied handset and the handset is from 2020 it would be one that needs specific firmware at the time across all networks...

[MI5]

I've already stated the age could be an issue but having checked it was a supported device on O2 without the need for specific O2 firmware.

No * next to device.

Wifi and 4G Calling device list

Wifi and 4G Calling is currently available on the following devices:

• iPhone SE 2020, 11, 11 Pro, 11Pro Max, iPhone Xs, iPhone Xs Max, iPhone X, iPhone Xr, iPhone 8 Plus, 8, 7 Plus, 7, 6s Plus, 6s, 6 Plus, 6, SE
• Samsung Galaxy Note20 Ultra 5G, Galaxy Note20 5G, Galaxy Note20 4G, Galaxy Z Flip 5G, Galaxy Z Fold2 5G, Xcover Pro, A21s, A41, A51, A51 5G, A71, S10 Lite, Galaxy Fold 5G, Galaxy Z Flip, S20, S20 Plus, S20 Ultra, S10 5G, Note10, Note10 Plus 5G, S10, S10e, S10 Plus, S9, S9 Plus, S8, S8 Plus, Note8, S7*, S7 edge* and J3 2017*, A10, A20e, A50, A70, A8, A3 2017, A6, J6, J5 (2017), A5 (2017), Note9, A7, J6+, J4+, A9, A90 5G, A40, Xcover 4S.
• Sony Xperia 5 II, Xperia L4, Xperia XZ2, Xperia XZ3, XZ2 Compact, XZ Premium*, Xperia XA2, Xperia XZ1*, Xperia XZ1 Compact*, Xperia 10, Xperia L3, Xperia 5, Xperia 1, Xperia 10 II and Xperia 1 II
• Oneplus 5, 5T, 6, 6T
• HTC U11*
• Doro 8035*

[jonsie]

This could run and run

[line-wait]

Yup sorry, my wording was unclear.

I meant that this phone model is one that was, in the past, sold by O2.

I bought mine second hand a few years ago - it never had Three specific firmware on it (as far as I know). I suspect that it might originally have been sold by O2 because I remember it still had an O2 splash screen when I first got it. It would have been sold as "unlocked". I imagine I did a factory reset at some point after getting it.