Unable to detect SIM card while running on battery

[techiesms]

I tried writing script that send SMS that contains GPS coordinates in it. The script works fine when I test with USB to TTL Programmer attached with the A9G Board. But when I remove that and try to power A9G board with battery or direct USB it doesn't work at all. It say's SIM not inserted

can anyone tell me the exact problem ?

[machiobrian]

Have you checked the power drawn while establishing a GSM connection?

[machiobrian]

RESOURCE 1 https://github.com/Ai-Thinker-Open/GPRS_C_SDK/issues/421

[enekux]

Hi, I am having the same problem as you @techiesms. Did you ever found a solution to this problem? Thanks and regards!

[enekux]

Hi @techiesms did you ever find a solution to this? Thanks