I am using Adafruit FONA Adafruit FONA, for a long time. In the past I could send SMS just fine. I have connected it to the Arduino MEGA 2560 R3. I use Adafruit FONA library, configured to the right connections:
#define FONA_RX 10 #define FONA_TX 63 #define FONA_RST 7
The problem now, is that when I try to send SMS to a cellphone, I get this error:
FONA> s Send to #1234567890 Type out one-line message (140 char): hello world ---> AT+CMGF=1 <--- OK ---> AT+CMGS="1234567890" <--- > > hello world ^Z Failed FONA> ERROR
I changed the SIM that I have inside with other 2 SIMs, in case there was a problem with the SIM card, nothing changed, the same problem…
Can anyone figure out, what is wrong? I also tried to read battery voltage—> everything OK, RSSI —> everything OK.