Maker Pro
Maker Pro

Interfacing TC35i Problem

Hi,
I am interfacing a TC35i.
I have a problem which is :
When there isn't SIM I can connect to serial port and send and receive AT command.
But when I insert SIM card it is going off after a few seconds. during that shot period of time I can send AT command and it show SIM ID too, There isn't any output to serial on shutdown.
I would appreciate if you can help me.
 
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