If you want to use a different SIM card then the one included in the FarmCam Mobility package you need to follow the steps below:
1. Create a .txt file and name it "my_custom_apn.txt". Note that the name of the file can not be anything else. You can find an example attached.
2. The file content is as below. Please contact your mobile operator to find out the APN, username and password of your SIM card.