If you post on CreigsList you may get text from this number. It's the old shipping scam. I'll wire you money and extra for the shipper but you have to send the extra back. When it all washes out you will be held responcible for money sent back. Something like this:

Thanks for the phone number though am yet to give you a call to be sure i can get in touch with you on phone because as it is now i may have to send you an overdraft which will include my shippers fees as well.Am doing this bacause am away to Ireland for my conference as i said before and my shipper has requested for an upfront to be sent to him before he can pick the car up from your place.Anyway,i guess can expalin this better to you on phone.thanks again,and am still very much interested in
buying the car.

P.S:in the main time i`ll require that you send me your full information (name and contact address)so that i can contact my bank with it before sending you a cheque.
Best regards and i await your response,