Hi abasel, i have the same problem. forgive my poor English.
I worked before with sim900 which is basically the same but older, withouth problems. I have done projects of iot, etc. The new sim800l modules i am testing, the most typical:
I've tried with movistar and vodafone sim, with the same results. I cant register to gsm and i only fin one operator , I suppose it will be fictitious (is not within reach of my MT, according to my other sim900 module). Amena in this case:
in both modules, with both SIM´s ¿?
Of course, VCC ok, sim pin ok, band ok, signal ok:
AT+CBC
+CBC: 0,94,4153
OK
AT+CPIN?
+CPIN: READY
OK
AT+CSQ
+CSQ: 26,0
OK
AT+CBAND?
+CBAND: EGSM_MODE,ALL_BAND
OK
I've been trying for a week to register it on the gprs network, with no results. I'm starting to think that it's incompatible with certain types of sim cards.
Have you achieved anything since your last post?