This was available last year, and recommended by Martin Lewis.
Place a free vote for the XFactor by going to http://free2call.tv/X-Factor.html,
clicking your wanted contestant and phoning the 0333 xxx number given (same cost as a local call/included in mobile inclusive minutes).
Listen to a 15 second advert, and bob's yer uncle.
Remember to wait until the lines are open at the end of the show, they should be open for around an hour after it finishes.