I have a SIM800L module, but it cannot find the network(board LED blinking every second)
The SIM card was working fine on my phone
I'm sure the power isn't the problem, because I used 5v from Arduino board with a diode(drop voltage to 4.3v) and 4400uf capacitor, even tried with a 3.7v Lithium Ion battery
---> AT+CSQ
<--- +CSQ: 0,0
RSSI = 0: -115 dBm
---> AT+CREG?
<--- +CREG: 0,0
Network status 0: Not registered
---> AT+CMGF=1
<--- OK
---> AT+CPMS?
<--- +CPMS: "SM",0,30,"SM",0,30,"SM",0,30
---> AT+CPIN?
<--- +CPIN: READY
---> AT+COPS=?
<--- +COPS: ,(0-4),(0-2)
---> AT+COPS?
<--- +COPS: 0
---> AT+CBAND?
<--- +CBAND: DCS_MODE
how can I solve this problem, is possible that the module has broken?