SIM not in or APN issue.
Can you post your peers clipper file, secrets file ( password changed to ****) and gprs file.
in minicom can you send other commands such as
at+csq?
this is should two sets of numbers.
AT+CPING=“www.baidu.com”,1,4,64,1000,10000,255
that should do a ping test
I have been having issues as well, maybe some of this will help you.