Yeah, this will totally work and doesn't stink of a scam at all! While you're at it, tell him your dead uncle is the King of Algeria and he left you $45614854564165489165 in unclaimed money and you need his help to get it out of the country. Then you'll have access to his bank account and unlimited funds! Problem?
Call him from a different number; tell him he has won a car (or some random b.s) in a contest that his name was entered in. Ask him to confirm his contact information for security reason's, so that he can claim his prize.