I Have A domain and i have space of 1 gb and unlimited bandwidth i want to sale it because i am not using that.
...and the domain you're selling is?
I have a feeling he's referring to a hosting account rather than a domain...
No such thing as unlimited bandwidth. Obviously some sort of scam.
Some hosts offer unlimited bandwidth. It's not necessarily scamming, it's just overselling.
Unlimited b/w is just for marketing purposes.