Looking to sell my 5s and I want to ask for advice before I do anything. My 5s is unlocked. If a potential buyer wants information, what is the information that I can or can't share with them? I've read mixed thoughts on providing IMEI. Some say yes while others say no. At most, all I should provide if asked is the IMEI to check the phone is not stolen and that it really is unlocked, right? There's nothing else I should provide? Thanks.