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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4GB Apple iPhone 2G Unlocked

US $167.50 (11 Bids) 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 $51.00 (9 Bids) End Date: Friday Mar-12-2010 12:15:01 PST Bid now | Add to watch list

Apple iPhone 4GB 2g (Unlocked) deadstrip near top scree

US $50.00 (0 Bid) End Date: Saturday Mar-13-2010 11:57:32 PST Buy It Now for only: US $200.00 Bid now | Buy it now | Add to watch list

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

US $219.99 End Date: Sunday Mar-14-2010 20:45:19 PDT Buy It Now for only: US $219.99 Buy it 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

Apple iPhone Unlocked 4GB Cell Phone 2G

US $0.99 (1 Bid) End Date: Tuesday Mar-16-2010 15:42:21 PDT Bid now | Add to watch list

Unlocked Apple iPhone 2G 4GB Works Great Not Perfect

US $179.00 End Date: Thursday Mar-18-2010 18:36:16 PDT Buy It Now for only: US $179.00 Buy it now | Add to watch list

Unlocked Apple iPhone 2G 4GB Works Great

US $199.00 End Date: Thursday Mar-18-2010 18:38:45 PDT Buy It Now for only: US $199.00 Buy it 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