SM5100B and CME Error: 33

Wireless & IoT
1

This error doesn’t appear in the manual, but I get it from time to time, usually after initializing a TCP connection. Has anyone got information on what the cause of this error is, and what the solution might be ?

thanks.

2

I had to make sure “AT+CGACT=1,1” returned OK,

I used “AT+CGACT=0,1” to disconnect after transmissions but that seemed to break my socket, now I detach GPRS services “AT+CGATT=0” … that seemed to work