GSM network and status led not working | Electronics › Electronics › Problem with GSM SIM900 module › GSM network and status led not working January 23, 2017 at 4:37 pm #14362 Hari Prasaath KParticipant Pooventhan.. 1. Have you changed the sim card and tried.. 2. Check with any problem in the antenna. 3. Check with any problem in the sim card holder..
