I cannot connect to the internet using 4G. This seems to coincide with upgrading my data allowance on 24th Jan 2021 but it has taken a while to confirm as I have mostly been in a place where there is wifi. The phone (iphone 5S) connects eventually using 4G in my home but not in my studio (no wifi or hotspot) or car. I have no idea how to solve this. When wifi is enabled the connection speed is fast. My husband has no issues in the same studio.