with this message I'd like to report a problem concerning my Samsung Galaxy S7. I've recently bought an ATT model on the web, but I've noticed that it was previously "debranded". When I insert the SIM, it is recognized without problems, but it's not allowed to connect to any network operator. In detail, if I go through "Connections"> "Mobile Networks"> "Network Operators", whenever I press "Search Networks" I get the message "Error while searching networks" or "Can not connect ...". I checked the IMEI and it's ok. So my question is this: is there some kind of blocking by ATT? In case, could it be possible to unlock?
*Update* since this site is 1st in Google search ...currently this issue has resurfaced but for a different reason. My guess is the last OS/Android patch is not compatible with current firmware. Anyway...the work around is now this (at least for me):
1. Navigate to Settings>Connections>Mobile Networks and uncheck the Mobile Data ticker box
3. Navigate to Settings>Connections>Mobile Networks and check the ticker box
4. Navigate to Settings>Connections>Mobile Networks>Enhanced LTE Services and check the ticker box. (Note * check this setting often as it disables after restarting)
You should now have access to internet/mms...if not...try resetting the APN 1st then maybe repeat these steps.