Smith has signed a four year deal at Fratton Park.
He told Portsmouth`s official website: "I spoke to Paul Hart and it sounded brilliant. Everything down here is certainly what I was looking for and I'm sure I made the right decision.
"When I've played at Portsmouth the atmosphere's been electric and it'll be nice to play on the right side of them this time, so I'm looking forward to it."
McAnuff has completed his move to the Madejski and joins Brendan Rodgers. Jobi has signed a three year deal.