I have been using GSM Modem at work for sending sms notifications for a while. It was working good, however when I tried using it today it gives me +CME ERROR: 262. This means: Sim Card is Blocked, I have no idea why.
Previously these commands worked:
ATZ
OK
AT+CMEE = 1
OK
AT+CSCS="UCS2"
OK
AT+CSMP=17,167,0,0
+CME ERROR: 262
AT+CMGF = 0
OK
AT+CMGS = 81
+CME ERROR: 262
I have tried other SIM cards, and used GSM 7 encoding, but I still get same error.
UPDATE: I tested this Card on mobile phone, ant it works perfectly, however any SIM I put in GSM modem, is Blocked somehow.
UPDATE: I changed my modem with same model modem, ant it works. Probably some hardware malfunction of this old modem.
So I have found that was causing this issue.
It seems what SIM card inserted into GSM modem didn't have good contact. I changed my modem and now it works like a charm