I did research on this number it is a Nigerian Phone # & a live person answers, but it sounds like a lot of people talking in background, this is one of the scammers phone numbers!
Also getting called from Nigeria 2348080345149 started on the 22/3/11 only answered my phone once, since then I have downloaded an app called 'Blacklist' onto my Android HTC phone.
You can then blacklist all calls and SMS. I would think there is an app for the iphone.
If you have a android or iphone there are plenty of app's which blacklist calls. I am using one on my HTC android phone called Blacklist. Now my phone doesn't ring when I am called from these Nigerian numbers. The app ends the calls for you in silence. Still not stopped them trying 5 x a night though, hopefully they will eventually get the message and stop phoning.