Can't connect to cellular calls in `italy

[gl37]

I have two sim cards in different phones, the sim cards connect to data but do not connect to cellular calls and texts. When someone calls the number it goes straight to voice mail..

[Enlli]

Check that 4G Calling (wifi calling) is active on both phones. You can't call without it as,4G is a data network and there is now no 3G there

[pgn]

Good call on the 4G Calling! I must see if this map has begun to show the removal of 3G here in the UK yet... https://community.o2.co.uk/t5/Discussions-Feedback/3G-switch-off-dates-for-UK-networks/m-p/1618640/h...

[Enlli]

Vodafone have started the big switch off in the UK.

Looks like O2 will be the only one in 18 months.