Hi Chris, your reviews of the Redmi note 7 phones are excellent.
Could test for the follow following:-
1. Connect the Redmi 7 to the mobile network (i.e. to the telecom)
2. Turn on the Redmi 7 Hot Spot
3. Then connect a device such as laptop, tablet or another phone via the Hot Spot
4. If the device connects ok check if the device has internet access (i.e. has internet connectivity from the phone’s hotspot.
This is an important feature/service to have on a phone.
Regards, barry