Improper plan, SIM card plan expired, SIM card carrier changed plan. Check the time between photos, it should be set for 2-3 minutes, anything less than 1 minute and the camera may not have enough time to send the photo before attempting to take another, which will lock up the camera. Do a manual send, turn the camera onto setup, wait to get a signal. Click OK to take a picture and click OK to send, if you receive an error, see ERROR Code (3G cameras only). Check to see if the batteries are dead, replace batteries. If you are sending it the command code to take and send a photo, make sure you are sending it straight to the camera as a contact, do not reply to a group text.
See also formatting SD card.
Last Update: 11.06.2020