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Topic: Can't register GSM (Portugal - Europe) (Read 2212 times) previous topic - next topic


Apr 08, 2017, 08:01 pm Last Edit: Apr 08, 2017, 08:07 pm by biscuit
I'm using this GSM module I bought on ebay (SIM800L GPRS GSM Module SIM Board Quadband L shape Antenna for MCU Arduino):


100% New and High Quality
Model: SIM800L
Work voltage: 3.7~5V
Network support: Quad-Band 850 / 900/ 1800 / 1900 MHz - would work on GSM networks in all countries across the world.
TTL serial interface compatible with 3.3V and 5V MCU Microcontrollers,competible with arduino.


I cannot seam to register in my operator network (Vodafone Portugal).

(OPS available) AT+COPS=?

+COPS: (1,"vodafone","voda P","26801"),(3,"OPTIMUS","OPTIM","26803"),(3,"TMN","TMN","26806"),,(0-4),(0-2)

(registering error) AT+COPS=4,2,"26801"


(It seams its trying to search for an operator) AT+CREG?

+CREG: 0,2

MY CSQ (signal quality is 0)


+CSQ: 0,0

I can't send SMS

Things I've done

Power up my GSM Module with an external Power source (my bench PS has 5A).
I've connected VDD to 3,3V and 5V (arduino) but I don't know what this does. The rest of the pins are all connected.
I blocked both 4G and 3G of my SIM card with my phone for it to work only with 2G.

Any thoughts on this?


I've similar problem.
Did you solved it? if it is, please share here.
Thanks and regards
Assini Hussain


I have the very same problem. Does anybody have an answer? Thank you.

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