Nextel 7510 black berry

I just purchased a nextel black berry 7510 on ebay I took the sime card out of my other nextel and put it in the black berry. It lets me call out and receive calls and also receive and send text messages but the only problem is that none of my contacts are in the phone. How do I get the phone numbers from the sim card to display or put in my contacts.
Any suggestions.

Thank you,
Este