CODEWITHSUNDEEP
arduinosmsgsmat-command
navjosh
navjosh

Reputation: 187

SIM800 gsm Module returns 0 on AT+COPS?

I am using SIM800 Module with Arduino Micro. It responds well to basic AT commands. But I am unable to send SMS from this module as:

AT+CMGF=1
ERROR

Now while further debugging I saw that AT+COPS? Returns 0, which means it is not connected to any operator. That may be causing the CMGF failure. But my AT+COPS=? returns multiple operators. I have an Airtel working SIM. Initially, it was showing AIRTEL too in AT+COPS=? but not now.. anything to do with the signal??

AT+COPS?

+COPS: 0

OK
AT+COPS=?

+COPS: (2,"405800","405800","405800"),(1," IDEA CELLULAR Ltd","IDEA","40404"),(1,"40505","40505","40505"),,(0-4),(0-2)

What is going wrong here? any inputs?

Upvotes: 2

Views: 15539

Answers (3)

Myrman de Luna
Myrman de Luna

Reputation: 1

Might be some power issues, but I fixed mine by just trying some AT command

AT+CBAND?

Then, AT+CBAND="DCS_MODE"

That works for me. Give it a try man.

Upvotes: 0

Nikhil Jain
Nikhil Jain

Reputation: 36

Go to an area where the signal strength is pretty good. Check for AT+CSQ, this will tell you the signal strength. Do check for AT+CMEE=1 for error report.

Upvotes: 0

SoreDakeNoKoto
SoreDakeNoKoto

Reputation: 1185

It seems there's no service for your network close to you. The module is unable to register with the network. The command AT+CREG? will probably give you +CREG: 0,3 meaning it couldnt connect. AT+COPS=? is a query that yields the possible options for the result of a command or its inputs. Move your circuit to another location and see if AT+CREG? returns +CREG: 0,1 or +CREG: 0,5 which signifies a valid network registration.

Upvotes: 0

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