* Does the SIM work in another handset? If not you need a new SIM.
* Is the handset unlocked, i.e. will it accept SIMs from different networks, or just the network it was originally sold on?
I can't suggest more without knowing more about the handset, the SIM, what networks. If the answer isn't in the two questions above, you could post again with more information (don't worry about long posts - more information is better than missing something relevant), or else register so that you can post in the main forum, where more people can see the question and we can discuss it properly.
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