To use an unlocked iPhone, you must have a plan with a mobile provider that uses a sim card. So AT&T and T-Mobile come to mind for US-based users, Rogers in Canada, Orange in many European countries, Hutchison in Australia, and a whole host of others globally.

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iPhone 2g 4gb Unlocked (Broken) P*R

US $22.50 (2 Bids) End Date: Wednesday Mar-10-2010 9:03:06 PST Bid now | Add to watch list

UNLOCKED Apple iPhone Camera 4GB 2G 4 GB i Phone 572

US $219.99 End Date: Thursday Mar-11-2010 19:44:42 PST Buy It Now for only: US $219.99 Buy it now | Add to watch list

4GB Apple iPhone 2G Unlocked

US $99.00 (0 Bid) End Date: Thursday Mar-11-2010 21:20:58 PST Bid now | Add to watch list

Apple iPhone 2G - 4GB WORKS needs digitizer! Unlockable

US $31.00 (7 Bids) End Date: Friday Mar-12-2010 12:15:01 PST Bid now | Add to watch list

UNLOCKED APPLE IPHONE 2G - 4GB + 1 Year Warranty

US $150.00 (2 Bids) End Date: Monday Mar-15-2010 2:23:14 PDT Bid now | Add to watch list

Brand New Sealed Unlocked Iphone 2G 4GB NOT 3G 3GS

US $450.00 End Date: Sunday Mar-28-2010 18:02:17 PDT Buy It Now for only: US $450.00 Buy it now | Add to watch list

Brand New Sealed Unlocked Iphone 2G 4GB NOT 3G 3GS

US $450.00 End Date: Thursday Apr-08-2010 15:11:18 PDT Buy It Now for only: US $450.00 Buy it now | Add to watch list