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Thanks! I'm considering selling my 16gb iP4 for an offer I received today--- $650... Do you think I can go higher? It's opened but in mint condition.
 
Just be careful, a lot of people have sold their phones only to have the buyer state the box was empty and PayPal refunded the money.
 
Here's what I would do if I was going to sell an iPhone I had owned:

1. Restore as new.
1. Jailbreak the device.
2. Find a zero out utility (like this one: http://totalsmartphone.net/2010/03/iwipe-cleanse-iphone-user-partition-iwipe-iphone-jailbreak/) in Cydia to zero out the user partition of the device.
3. Restore again (probably in DFU mode).
4. Maybe re-jailbreak if you think you can add it as a "feature" to the sale, but I never get that since it seems as though it wouldn't do the buyer any good the first time they decide to sync with their machine.

It's a bit paranoid, but it's pretty secure. In theory someone could jailbreak a purchased iPhone, SSH in and use a utility to look for undeleted personal data that hadn't been zeroed out.
 
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DiamondGCoupe said:
Just be careful, a lot of people have sold their phones only to have the buyer state the box was empty and PayPal refunded the money.

You don't need to worry about that if you follow all the procedures to make yourself eligible for paypal seller protection (and insure the item).
 
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