Having had a couple of iPhones on gumtree over the last 2 weeks I've had several messages which I believed to be fake, just the way it sounded like my name is so and so can you please email me on this address with your final price, etc. I just knew it wasn't a real reply, and also the fact that it came up with the persons name at the top, rather than just a number as it would with a genuine response. How do they do that? 
I bet a lot of people reply too!
EDIT. I put this here because it's to do with mobile phones, hope I made the right decision!

I bet a lot of people reply too!
EDIT. I put this here because it's to do with mobile phones, hope I made the right decision!