Here, 2G was disabled for phone and small IOT users 5 years ago. It was kept on for metering (power, water etc) only. The modem was swapped out of my power meter this week for a 4G one. So the 2G network will probably be completely removed in a year or two.
The big problem is that a phone is only able to use VoLTE and Voip if the manufacturer has put settings for the network in the phone. Even then, operator/network changes can break it.
Sony did not sell the X10 III here, and there is no way to make it do volte on any of the networks in the country.
If you bring your Sony here, it won’t be able to make a voice call once 3G is shut off.