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If it is a used phone and it was never wiped. Then the old security code is active. Changing the sim does not change the security code of the device. If it is asking for a sim security code, then the sim card is locked and you must have the code or the sim is just a piece of plastic. Did the service provider put a code on the sim and forgot to tell you.?..Take the sim back and ask for another without the security code on it. Sims can be coded so that if they are stolen they cannot be used in another device.
If you are trying to use a SIM card in your phone and getting a message like
"Enter Subsidy Code", "Incorrect SIM Card", "SIM not
provisioned" or similar messages, then you need an unlock code for your
mobile phone. You
can get HTC Aria Unlock Codefrom
the network provider, they will verify the account holder information. You may check this HTC Unlock Code
site, they will provide you an accurate code fast with easy to follow instructions on how to unlock your phone. Once your phone is unlock, it will work with any network worldwide without sticking to one network. Hope this is helpful. Thanks.
If the sim is faulty, then it can cause this problem.
If the phone does the same with different SIM cards, then check the sim contacts in the phone slot, if you cannot find anything wrong, then it is an internal problem, probablu with the circuits connecting to sim card slot on the phone.
its may be diue eo virus infection remove memory card and dial code *7370# and *7780# . the phone restars and formts itself . during every code the phone ask for security code ( defult is 12345 ) and restars . if problem soves formt ur mmory card and reinsert it