[gnowegroeg]

I am reluctant to edit more than the APN name under "General Radio" using "escreen://", someone mentioned that may inadvertently affect other functions of the phone.

The (Internet/CARRIER_APPS/CARRIER_ADMIN, etc) you mentioned are under "Data Services" but I do not see any username / Password fields, also, it seems like the APN field is auto populated from the APN field in "General Radio".

According to /Settings/Security amd Privacy/SIM Card/:
Network is unlocked
Network Subset is unlocked
Service Provider is unlocked

So I believe the device is unlocked.

I do not have a dead microsim card to try, wonder what that would do to help?

Thanks