TRM240 just hangs when SIM card is inserted

[Marijus]

Hello,

It looks like there was a small error in the script. The line OK ATD*99 should be written as OK ATD*99#.

You can try using the following script:

ABORT "BUSY"
ABORT "NO CARRIER"
ABORT "NO DIALTONE"
ABORT "ERROR"
ABORT "NO ANSWER"
TIMEOUT 30
"" AT
OK AT+CGDCONT=1,"IP","your.apn.here"
OK AT+CGACT=1,1
OK ATD*99#
CONNECT

Additionally, please insert the SIM card before booting the device. If the connection does not establish on the first attempt, unplug the modem and plug it back into the Raspberry Pi. You may need to repeat this a few times.

Best regards,

[Marijus]

It is also quite important that you establish a connection with those TRM240 devices to any other device (I recommend a Windows PC) as they can be faulty. You can find the drivers for TRM240 here: TRM240 Downloads.

Best regards