Restore it in iTunes. Then when iTunes says "You device is restarting. Leave it plugged in." unplg your iPhone. Then turn it off with the red slider and remove the SIM. Now when the buyer gets it, it'll be just like a factory iPhone.
Restore it in iTunes. Then when iTunes says "You device is restarting. Leave it plugged in." unplg your iPhone. Then turn it off with the red slider and remove the SIM. Now when the buyer gets it, it'll be just like a factory iPhone.