Sim900 list of operators question

Hi friends!!
I'm on holiday :slight_smile: and i'm working on sim900 shield module.
my question is:
why if i execute AT+COPS=? i'll got only this response :
+COPS: (1,"vodafone IT","voda IT","22210"),,(0,1,4),(0,1,2)
only one operator............

but if i use a phone i can call other operators ?????

thanks for a response.

You can call any number but can you join any operators?

If I remember correctly the command returns the list of networks that are avaialble to connect to (ie your contract is valid to join that network)

Hi,
i'll try to explain it.
If i use a sim900 shield i can use only vodafone operator to receive calls.
In fact if i use AT+COPS=? in hyperterminal without sim card returns :
+COPS: (1,"vodafone IT","voda IT","22210"),,(0,1,4),(0,1,2)
if i try to use other operator like TIM or ILIAD can't connect to network.
But... if i insert TIM or ILIAD in a smartphone i can receive and make calls.

I know that sim900 shield module use 2g,4g ........ now i'll check if is a type of network problem.