Transfer them from the Nokia SIM to your computer (you can get an adapter that will allow the SIM to be read by your computer). Then import them into a contacts app on your computer, and sync it to your iPhone.
Ask your carrier to transfer them to an flash drive, then import into an app on your computer.
Ask your carrier to copy the Nokia SIM to a nano SIM like the iPhone uses. Temporarily put it in the iPhone, then go to Settings/Import Contacts from SIM.
Carefully cut down the Nokia SIM so it fits the iPhone and use the import function mentioned.