I) AT command setting part (1) AT+CGCLASS=”B” Set to “B” mode (2) AT+CGDCONT=1,”IP”,”CMNET” Set APN (3) AT+CSQ Check the signal. If the signal number returned is between 10-31,0, continue. If the signal is 99,99, you should consider continuously typing the A/ command to keep letting the module search for the network. (4) AT+CGACT=1,1 Activate. If it returns OK, continue (5) AT+CGREG? If it returns 0,1, it is OK. If it returns 0,0, it is not OK. Return to (1) and start again. Alternatively, keep typing A/ and execute the AT+CGREG? command multiple times. (6) AT+IPR=115200;&W Change the module speed and save.
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