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iPhone 6s - Mobile Data Options
Black Box
30-08-2016
I have an iPhone 6s on the Three network.

In the Mobile Data Options (Settings > Mobile Data > Mobile Data Options) I have "Enable 4G" set to "Voice and Data".

When I make a call, my phone switches to 3G, then back to 4G when I end the call. Not a problem...just interested to know why it doesn't stay on 4G?
corf
30-08-2016
Voice wasnt really included in the 4g standard like it was with 3g.

What we have is volte (Voice over lte) - which depends on the phone software and network rollout.

All networks currently fall back to 2g/3g for voice except in certain volte (or three's supervoice ) areas with the correct phone combination - pretty much iphones and certain network branded android phones,
Black Box
30-08-2016
Thanks Corf...that's interesting to know!
packages
30-08-2016
Originally Posted by Black Box:
“Thanks Corf...that's interesting to know!”

Yea currently on 3 you will only stay on 4G for voice calls when you are on the 800mhz band. This only happens when you do not have 1800mhz or 3G available. Hopefully this will change soon so that VoLTE is live on the 1800mhz band too. Ensure you keep voice and data 4g switched on as you may discover areas with signal where you didn't previously.

The only other network that has VoLTE publicly live is EE. You get 4G calling whenever connected to 4G on the iPhone. I believe Vodafone and o2 are currently testing.
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