Sign up for a £30 FREE bet with Betfair. Cash Out your In-Play bets, place a Multiple and get the best value. We also offer Games, Poker, Bingo and Casino. Betfair has launched a new mobile website for the Exchange, with a host of new features that will give punters the edge and bring them closer. The Betfair Mobile Exchange has a host of new features meaning it is the only place to go for your Exchange betting. Here's the lowdown on the.