sim card rejected nokia 2310

i am not able to reopne my nokia 2310 it shows sim card rejected.

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Is the sim for a different service than the one you used previously?

Hi,
If the rejected sim card belongs to a different carrier, then your phone may be locked to its network!!!Inorder to use other carriers, you should first unlock your phone!!! Though there are many methods to unlock a phone, unlocking using codes is easy and the safest method!! You can get the codes from your service provider or from reliable online sites like ****

Your sim card is rejected by your network service provider and you should contact to your network service provider,if not solved, go to Nokia Care Center.