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Before you do anything with it, please clean the sim card and sim card connector on the handset. Even a small rust/dust can create this problem.
If it doesn't help, you need to check the Sim card on another Handset. In most cases, this is damaged sim connector, and will be necessary to replace or re-soldered/refreshed. Sometimes even sim IC is the culprit which you need to replace or play jumper tricks. I would suggest you to get it done from a service center or from a nokia mobile repairing center.
In this case if ur mobile got damaged by water then u have to change ur display and batteries in most cases there is no isue with batteries ur is nokia 1600 so it will take only 300 Rs.
SIM pin code: This is a pin code that locks the sim card until you enter the correct code. This protects your account, even if your sim is put into another handset. To reset it, you need the PUK code: Pin Unlock Code (PUK) If you miss key (or forget) your SIM pin code, and enter the wrong one 3-5 times in a row, the SIM will lock up, and you’ll need to enter the PUK unlock code to release it. You should ask your Network Service Provider for this code when you need it. Don’t try to guess it, because after a few wrong guesses, the SIM card will be permanently disabled. Phone Security Code: This locks the handset, as opposed to the sim card. You can also set some handsets to only accept a “new” sim if the phone security code is entered. To reset it, you need the Master code code: Master Reset Code
Sometimes known as the Master Code, this allows you to unlock a handset if you have entered the Security Code wrongly too many times.
The default security code for Nokia is 12345 I need the IMEI (International Mobile Equipment Identity) number. Type this code in your phone to get it: *#06# you can also find it beneath the battery. Then I’ll give you the Master code to reset your Security code.
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