(maybe a bit easier with AT&T since they are GSM and can be used in most countries)
Except AT&T does not unlock iPhones, so this is a moot point.
I know that Verizon iPads are harder to sell... So I'm guessing it could be the same for iPhones
If I purchase a used Verizon iPhone and the ESN is clean, can the person that sold it to me call Verizon to report it lost/stolen making it a bad esn?
Except AT&T does not unlock iPhones, so this is a moot point.
Well the GSM iPads are unlocked and can be used on any network while the Verizon ones aren't. I would imagine since most iPhone 4's can't be unlocked unless AT&T decides to start unlocking them they will be about the same as far as difficulty in selling them goes.
That's what jailbreaking is for.
Don't forget some people will buy an iPhone vs getting an iPod touch. Because of the camera features. And two you can use it as a phone if you do google talk or Skype.
For clarification, the reason AT&T does not unlock iPhones for international travelers such as myself, is that Apple's contract will not allow AT&T to unlock them.Except AT&T does not unlock iPhones, so this is a moot point.
then...Yes it will be much harder to sale!