Whether your Nokia N900 phone displays an error message saying "Insert Sim card" when you inserted a sim then your phone is probably network locked.
To unlock it,visit TheUnlockArena.com here they are providing the unlock code with easy step by step unlocking instructions and unlock it.
SOURCE: Insert SIM Card
make sure the sim card can make good contact with the phone.
Also check if it doesn't have space to slide, causing it to loose contact with the phone.
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