About two months ago, I sold my black iphone 8gb 3G for $200 within 3 hours after posting the ad on craigslist. I got about 15 email offers. Some of the emails/offers I received (which were ignored/deleted) had responses like: "u take check???" and "ill buy it but we have to meet at X parking lot" and "i only give money order". Eventually, I got an email/offer from someone that I felt comfortable with, so it was at that point that I offered my cell phone number for them to call me and finalize the deal, we met at the local mall, in the food court, and the payment was made in cash. The phone was sold without a sim card, it was completely wiped and needed to be connected to an itunes account to be activated.
Some advice:
1. Don't post your phone number on craigslist, give out ONLY an email address for the initial contact. Only offer you phone number if you are comfortable with the potential buyer.
2. Meet in a very public place. (as stated above, we met at a food court at the local mall).
3. Accept only cash. I cannot stress this enough. ~DO NOT TAKE ANYTHING ELSE EXCEPT CASH~
the following isn't necessary IMO, but I did it anyway for peace of mind.
4. Unbeknownst to the buyer, I also brought the receipt showing that I owned/purchased the phone, a printed copy of the craigslist ad of the phone for sale, and I also took pictures of the phone's serial numbers. The buyer did not know that I had these items, but I brought them in the unlikely event that something went wrong.
Finally, be prepared to walk away. If the buyer shows up at the mall with a money order, check, gold necklace, ect ect or anything else EXCEPT CASH, walk away from the deal. If the buyer wants to meet anywhere else EXCEPT a very public place, walk away from the deal.
You hold all the cards, not them, you dictate (nicely) where the transaction will take place (very public place) and that you will only accept cash. There is a LOT of scamming and bad people on craigslist, and you must be firm for your own protection. If you must walk away from the deal for whatever reason, it's no skin off your back because when you re-post the phone for sale the following week you'll get 15-20+ offers again.