Re: Cellular Shield not attaching to APN - SIM OK, Settings OK? 06.08.2017 12:46 PM
Michael, Can you confirm if you are using the power supply that came with the shield? That 5V supply outputs 2.4A which is needed to ensure consistent TX/RX performance with the cellular network. If the unit is just drawing from the RPi or a regular 1.0A tyope of output there will be enough power for it to operate but not enough for it to perform correctly. The troubleshooting you have done indicates the unit is operational and the service is provisioned correctly. The power supply would be the first thing I would check.