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Solved! Go to Solution.
Try putting another sim card in from a friend. If it works, then you'll have to get your sim card changed. It should be a free change, since there's a limited warranty on the sim card. Also, try plugging your sim card into a friend's phone.
If both cards don't work, then your phone needs to be sent in for warranty.
Telus was great about giving me a new SIM free of charge. I talked to this on twitter and they credited my account for the cost of the SIM card, I just went immediately to a store and got a new one! Love it!
Check whether your sim is placed properly in the slot. Try to reinsert the Sim. Still if you face the same problem then your phone might be locked to particular Network. To solve this problem you need to get it unlocked. You can unlock your Nokia phone using unlock code. You can get the unlock code for your phone from your Network service provider or any third party online vendors like WickedUnlock.com here you need to specify your phone model,country, current Network name, IMEI number of your phone. Then they deliver unlock code to you through mail with unlocking instructions. Using this you can unlock your phone from Network lock easily.