sim card not detecting in sim900

[krishnakumar.r93]

Hi all,
I'm using sim900a module and it worked perfectly for more than 2 weeks without any problem. But, now when i insert any simcard, it doesnt catchup to the network. When i looked at the serial log of the sim900a, i get CPIN:NOT INSERTED all the time. The voltage on the simm-vdd is 0v. Tried resoldering the pins on the sim socket and the module as well. The VBAT of sim900 is 4v. The AT commands work fine.
How do i solve this problem?

 

[thirugnanam.ram]

Your SIM Module is communicating, but your network is not registered in the network.Check the Hardware thoroughly. There may me a short circuit. It may be happened by mishandling the hardware(without the ESD protection).

 

[krishnakumar.r93]

There may me a short circuit. It may be happened by mishandling the hardware(without the ESD protection).

There are no shorts. The rest of the board is working fine. Only i dont get the network.
There are no possibilities for mishandling, as the device is locked and i just opened to change the sim as the one i already inserted had gone not reachable. Heating wont be an issue, because there is enough air flow.

 

[hobbyckts]

Have you tried with another network SIM cards to find out the issue?

 

[krishnakumar.r93]

Have you tried with another network SIM cards to find out the issue?

Obviously, yes. i've tried with all the sim cards. ( AIRTEL, AIRCEL, VODAFONE, IDEA, DOCOMO)
I've noted the voltage on the sim vdd pin is 0. Why would it be zero, while all other functionalites (AT commands word) are good.? Is the module damaged.