@Cher Hi, looking at your screenshot, I think there is a bug in the modem firmware. If you look at the logs on the right you can see:

This means the sim card is detected and ready. However, one letter is missing. This is supposed to be +CPIN READY. So I think the serial tool is therefore failing to interpet the correct string.

Can you query the CCID/IMSI? If it returns a number then the sim card is for sure working. You can also try updating the firmware

Hi Artur,

one of our customers have been using https://opencellid.org/ in the past for cell-id localization. Telekom is also working together with Polte which offer an IoT localization API. You can learn more here: https://iotcreators.com/en/iot-location-api/ and sign up if you want to try it.

Florian