SIM not found

This is usually an issue reading the SIM card.
Clean off the SIM card using a pencil eraser. Remove the SIM card by pushing it in, it is spring activated and will pop out. Once removed, be careful not to drop or damage it, gently clean off the brass portion using a pencil eraser. Blow off the excess residue and re-insert the SIM card back into the camera.
If this doesn’t resolve the issue, contact support for additional assistance.