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SIM900D not connecting to network

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syedsalmanalam

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I am having some problem with my SIM900D, at first its got connected to the network but now it does not connects to the network. I check the AT+CREG command and the result is +CREG:1,3 3 means registration denied. I have this same problem with my old module then I changed the SIM900D SMD it worked fine with my interfacing board. Something is wrong with SIM900D. I have tested the module in other working interfacing board but still it is not connecting to the network. Please help me out :((
 

I have to give SIM_VDD was not working so i provided SIM_VDD with other voltage supply. Its working now
 

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