The Channel 4 website has posted some ringtones of people from previous Big Brother shows. Aisleyne's famous "know yourself" quote is one of them.
http://www.channel4.com/bigbrother/blog/25aa66c0988f5bdb6bafca51a5f5ba5d/view.c4
http://www.channel4.com/bigbrother/ringtones/retro/knowyourself.mp3