Apple Thoughts: How to Activate an iPhone Without the Original Sim Card

"iClarified.com has been poking around and discovered this neat trick. For users that have an iPhone 3G, 3GS or 4 but misplaced their original SIM card, there is a solution to activating your device."

If you need to activate an iPhone in iTunes, and you no longer have the original SIM card, you can use a Phonebook SIM card. It looks pretty simple in the video tutorial above. Of course, this will only activate the phone. You still wouldn't have cell service.