Mobile phones are a huge magnet for nigerian scamsters mate trust me on that one. I know someone who used to make a living selling old phones in joblots on ebay ans she had so much trouble and the turnover was weaker and weaker, she packed it in.
Like everyone else has said, Ebay used to be a decent place, but now it's own popularity and greed has been its biggest downfall. Granted it's still the first place i look when buying anything, but selling on there is just too much hassle these days and i've sold hundreds of stuff on there since 2003.
Give it a try, you won't find nowhere near as much exposure as you will on there. Just set some buyer requirements in the settings (min 5 feedback, uk only etc) and only post to verified and confirmed paypal address using special delivery on items with a value over £35