Selling Factory Unlocked Phone on CL - Tips?

[Diode]

I'm in the US and will soon be selling my factory unlocked iPhone on CraigsList.

Does anyone have any tips that I can do to prove it's factory unlocked? I'm on AT&T and don't have another SIM to try out - where is a good, cheap place to get one?

I haven't had a chance to try out the unlock myself as it's a fairly new phone. I'm not worried about the phone being actually unlocked - I did purchase it from the Apple store myself - but I just want to double check things before selling just to make sure.

Any tips would be great!

 

[ap3604]

If you unlocked it then they are gonna wanna pop in their sim card, in person, and verify that before they buy it (at least I would) so I would assume you don't need to really prove anything online. Just let them know its factory unlocked in the ad and make sure to meet in a public place with cameras (starbucks, apple store, etc) since I met a guy once on craigslist that tried to take my phone and run...