Software fail without SIM

Hi, I have received a Electron and ready to work with the SIM. We load a Blink software already through web IDE. When the 3G connection fail, the Blink program stop functioning and the green light start blinking waiting for 3G connection…If the 3G connection is lost the entire program stopped working??

That’s the normal/default behaviour.
You can opt for a different SYSTEM_MODE() or use SYSTEM_THREAD(ENABLED)

However, this is a question asked dozends of times in the forum hence it would be good to try searching for potential answers first (e.g. search terms like without connection, without sim, …)