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No volte available

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No volte available

Hello, 

I have had another Sony xz1 compact and this one supports volte. Volte and WLAN calls work  Fine. 

Now I get a new xz1 compact. If I go in to the settings I can't find the entry to enable volte. I don't change the mobile provider - it is still t-mobile. Their support tells me that I have to do updates. Yesterday I gets several system updates. No my firmware version is 47.1.a.16.20. But the volte setting isn't available. If I check for updates on your homepage it says there are still updates available. The correct version should be 47.1.a.12.119.

 

What must I do to enable volte?