If your TickTalk is not reading the SIM card or says No SIM, we have an easy solution.
First, put the watch near a window or door for better reception, hold the silver Power Button for 10 seconds, and restart the watch. If that is not working, please turn the watch off, remove the SIM card cover, gently pull up on the gold pins that are in a chevron pattern, and put the SIM cover back on. Make sure you are putting the SIM card cover in by placing the cut corner of the cover first and then pressing the rest of the cover down. Reboot the watch.