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SIM900 and preferred network list

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jefflynn

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Hi there,
I have a vehicle tracking device with SIM900, and in order to avoid heavy GPRS roaming costs, I want to modify the preferred network list in the modem. According to AT command manual, I have to use the at+cpol command, but the response is always ERROR.
at+cpol=1,2,"22002"
ERROR
Could anyone help?
 

How you are assigning "22002" in that <oper> and also on silly thing i might be saying use caps for AT command,
might you have typed it incorrect only ,
 

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