You can get the unlock code for a Nokia 100 either from O2 network provider or from any trusted vendor online at affordable cost.
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..............UNLOCKING INSTRUCTIONS..............
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1 - Switch on your Nokia 100
without any sim card.
2 - Don't bother as to what is displayed on your Nokia 100.
3 - Compose
#pw+CODE+1#.
4 - The Nokia 100 would then display the message "SIM Restriction Off" and will be unlocked!
Note :For Nokia 100 mobile phones locked to the network Fido or Rogers in Canada follow these instructions :
1 - Switch on your Nokia 100
without any sim card.
2 - Don't bother as to what is displayed on your Nokia 100.
3 - Compose
#pw+CODE+7#.
4 - The Nokia 100 would then display the message "SIM Restriction Off" and will be unlocked!
SOURCE: MobileUnlockGuide.com