4G during calls ?? only H+

[ReachingPull]

Hello!

I had a bike accident and since then I noticed something : 4G does not work during calls, the phone always goes in H +.
Is this normal?
Because I used to work with uber apps like and I managed to have commands during phone calls but no more now, I think that 4G is required  (and so, during phone calls I am on H+...).

Do you think that a shock could have affect the 4G ?

[Jonas]

Hi @ReachingPull, sorry to hear about the accident.

In order for the device to have an active 4G connection during calls, your operator needs to support VoLTE for your device/subscription, otherwise the call will be made over the 3G network and that is why you see the H/H+ sign, instead of 4G/LTE.

As the 3G network is busy with the call, you may not be able to access the Internet using mobile data during the call and that is why you are not able to access, for example Uber during a phone call.

The switch (if available) for VoLTE is in most cases found in Settings > Network and Internet > Mobile networks and is in my device called "Enable VoLTE if available" and there is a switch to turn it on or off.

I would recommend that you start with contacting your operator to make sure that they support VoLTE for both your device and your subscription, as Xperia XZ1 Compact supports VoLTE but it also needs to be activated by the operator.

I hope that helps!

[Remzee]

I have an Xperia XZ Premium (International Edition) and been using it in the USA with T-Mobile and it does the same thing, always switching to H+ during calls. Browsing is annoyingly slow during calls since it's using 3G. FYI, T-Mobile does support VOLTE and WIFI Calling. This isn't the operator. What Sony needs to do is they have to certify this feature with all US networks (ATT/TMobile, Verizon, etc.). My chinese phone (LeEco) supports volte when I put my tmobile SIM in. 

[zyxxyz]

Not all XZ1 Compact versions are VoLTE compatible.

Not all operators support VoLTE XZ1 Compact (probably there are different protocols or hardware requirements that operator software supports and XZ1C is too old to have all of them).

[Machiaveli]

Most operators require that the phone should have been bought from them to support VoLTE unfortunately.

Check if that's the case on your operator's FAQ.

[Jonas]

Hello everyone!

@Remzee, it's up to the operator to support the VoLTE and VoWi-Fi services for a specific device and customization, since the device supports it.

Have you talked to T-Mobile and asked if it is supposed to work with the version of the Xperia XZ Premium you have with the software version that you have? There are two different versions/models of the XZ Premium, Single SIM (G8141) and Dual SIM (G8142) and there are a lot of different customizations of the software depending on where the device was purchased.

As an example, in the Nordics where I'm situated, it will only work on an Xperia device that is released in this market and that has the Nordic customization of the software. It won't work with for example an Xperia XZ3 with a German customization.

@Xzca, there is only one version of the Xperia XZ1 Compact (G8441) but there are 30+ customizations and it might not be activated in all of them since the operators have not asked for it. In the Nordics we are pretty lucky as the majority of the operators nowadays supports VoLTE and VoWi-Fi, but it still took the operator that I use 1 year longer to activate the services compared to my colleagues that have different operators that have had it much longer than me.

@Machiaveli, that is correct and it's very different in the markets where the customization in the device is for a specific operator. In the Nordics, it's the same customization for all operators, but for example, in the UK, there are 3-4 different customizations for the different operators and it might only work with for example, O2 if you bought the device from O2 and not work if you bought it from a retail store or a different operator. It's a bit of a mess and I only have which models supports VoLTE/VoWi-Fi as the list would be endless if it also included all the operators around the world.

I can understand that it may be somewhat difficult to get information directly from the operator, but most of them should have a list of supported devices and if there are any other requirements. The Local support team in your market may also be better informed than I am since I work Globally and they may have the same operator and device and can say if it works for them or not.