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If your mobile phone is on a contract with a service provider, most of the times it will be locked in with them for the duration of the contract, So if you try to insert a sim card from a different service provider, it may say "sim card not valid' Try to insert your original sim card and see if that works.
Otherwise if this IS your original sim card and all of a sudden this message "sim card not valid" has appeared, then the sim card has gone faulty and you need to get a new sim card from your service provider eg... Vodafone.
This error usually occurs when you attempt to use a SIM card from a network other than the network from which the phone originated (e.g. your Nokia mobile phone originated from Orange UK and displays the 'Sim Card Not Valid' error when you attempt to use a T-Mobile UK SIM card). The 'Sim Card Not Valid' error usually means the phone has been restricted for use on one specific network and you would need to unlock the phone before alternative network SIM cards can be used.
could You test the new SIM on another phone? Could be the housing of SIM damage on phone - hardware problem - Nokia Service.
in any case you need to find out which network and ask them for the unlock code.
Only the original network to which it is locked can provide this code.
If your phone is telling you that your Sim card is not valid.
There is two possible conditions.
1) There is water on you sim card or it is dirty
What to do: Take yout phone apart (back caver, batteries, SIM card, abd
memcard) dry everything and clean it up. Then put it back together.
2) Your sim card is scratched. To ensure it try that sim in another phone and see....
Only thing to do: Buy a new Sim card.
Hope my info solves your problem, Thanx for using fixya....
hte thing is...ur phone is handset bundled offer phone..so til the validity ends on ur new sim card..the phone is designed to detect only new sim..so ucant change til validity ends...or u may approach any private local mobile repair shop..i wont cost u much..
ne other prob's do tell me..N plz plz do rate me cya