Nokia 8110 4g volte option is not showing after recent update due to this unable to make calls.

Purchased this phone 2 days ago and the update to version 13.x took a day after registration before it showed up for some reason, and after updating to 13.x I got this unable to make call problem.

I dont know exactly what Volte is since my phone is set on the Swedish language, but I suspected it might have to do with mobile datatraffic for 3G/4G and this phones subscription only has a 2G subscription for it's phonenumber.

So I went to the settings and turned of mobile datatraffic for the phone and then rebooted it and it could make calls again.

I suspect KaiOS never checks to see if a phonenumber is a 2G or a 3G/4G subscription so it tried to use 3G/4G when the mobile datatraffic setting is on.

This is what should be considered a critical bug that should be fixed a.s.a.p by Nokia/KaiOS by implementing a check that tries to make calls by 2G if 3G/4G dont work, or check the subscription type.

Until then you can fix it yourself by turning mobile datatraffic off, or maybe by uppgrading your phone number subscription to 3G/4G.

Why don't you temporarily swap a 3G/4G simcard from a friend to see whether you assumption that "uppgrading your phone number subscription to 3G/4G" works? That would be interesting.