Danipoak is correct, your contacts will be on your computer, thats if you sync regulary enough to keep them up to date.
If there contacts on your original sim card:
Do this-
Settings/Mail,Contacts,Calenders/Scroll Down 'Import SIM Contacts'
Hope this helps
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32gb iPhone 3GS 3.1.2 JB via Blackra1n
8gb iPhone 3G 3.1.2 JB
-John
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