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Hi if your Nokia e63 phone is displaying invalid sim message once you insert your sim in it then it mean your phone is locked to some other network provider due to this it wont accept other network sim until you unlock it .You can easily unlock your phone using sites like OnlineGSMUnlock.com they are providing unlock code for all mobile models at reliable cost .You first check that whether the code is available for your country and network provider .If yes then pay for it and unlock your phone .
What is your mobile model?Have you tried the mobile with other Indian sim cards?If you still get the same error then I think your phone is locked with a Saudi Arabian network.You need to unlock it...otherwise it wouldn't accept other networks.You can approach third party unlocking services like Unlock-zone.com and by specifying the mobile make,model,country and network to which the mobile is locked to you will be able to get the unlock service along with free unlock instructions.Once unlocked you will be able to use the phone with Indian sim cards. If the phone works with other Indian simcards without unlocking then may be there is a problem with the sim card that you are using now.Approach the network provider and get a new sim.
If you insert Sim it shows Invalid Sim means it locked to some Network,You need to Unlock it,You can get the free unlocking instructions from here Mobileunlockguide and get the Unlock code from here Superunlockcodes Then you can use any GSM Sim in the Phone,it will not show "INVALID SIM"
When you insert the SIM card from another phone into a different mobile phone and it ask for a security code, then this phone is locked to the original phone service provider.
For instructions on how to unlock this mobile phone, please click on this link and follow my instructions :- http://www.fixya.com/support/r4049238-unlock_cell_phone