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Sim300cz Reset when insert sim

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Abbod

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After performing the pcb design of sim module , it works fine BUT
after inserting sim card it reset periodically (after each 20 sec)and send 'Call Ready'

When I insert the card at no network coverage area it doesnt reset

Note : I dont use ESD but I think its not the reason ...

my operator:Vodafone EG

I also make short between RTS&CTS and bet. DTR&DCD ,Is it true ?

Can u help me please ?
 

Classic symptom of power supply problem - search this forum for related posts
 

    A

    Abbod

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Thanks GSM man ,
I was using 'BL-4c' Nokia Li ion battery
I m trying to use one of LM regulator classes to provide sufficient current >=2A
 

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