Please try that sim in another mobile if it still get error message then that means ur simcard is faulty. but if that work fine in another then that means your 3230 is faulty and you have to format that.
format with following code: *#7370#
after that it will ask for another code then insert 12345, your mobile get formatted now.
keep in mind that your all data on phone memory of that mobile get lost, if you that.
if nothin get right for you then you have to go nokia service centre at last.
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Try this, it might work for you. First remove any extra memory card and sim card inside your phone. After doing that, turn on your phone without those things. If there is message "Please insert sim card" then your good to go. Put your sim card back to your phone and then turn it on again. If it is successfully start then next thing to do is to insert the memory card back to your phone and then start up your phone again. But if in this stage your phone failed to start, then the memory card it causing the problem. If all fails, then you need to format or hard reset your phone. Hold the * + 3 + green call key and then start up your phone while holding those buttons until you see a screen that shows formatting. Make sure you have enough battery power to do this procedure. You can plug the phone charger to make sure that everything will be okay.
Please leave comments for further instructions. Thanks..
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1 - Switch on your Nokia 3230 without any sim card.
2 - Don't bother as to what is displayed on your Nokia 3230.
3 - Compose #pw+CODE+1#.
4 - The Nokia 3230 would then display the message "SIM Restriction
Off" and will be unlocked!
The letter p
appears if you press the button star(*) three times quickly
The letter w appears if you
press the button star(*) four times quickly
The symbol + appears if you press the button star(*) two times quickly
The CODE (2630111022) you need to enter is
the unique unlock code for your Nokia 3230