Classifieds - Warning - Scam?

Just to alert CAMC members. 

I have tried to sell a small item (£100-200) on the Classified section, and the responder rang alarm bells for me.  I have withdrawn from the possible sale before sending my details.   According to Google, the responder has a phone number logged to Japan (as far as I can tell), an email address for a person who lived/lives in the US, but the person is apparently now based in France.  The responder seems to endlessly ask for the selling price and require my cell phone number.  The responder may of course, be totally genuine, but I don't know. Just take care!