If you want to display your phone's image on a monitor or use your phone as a secondary monitor on your computer, I think the iDisplay app is the best. There is also a free version, although it is worth buying the payee. About 800Ft. If you would like to use your phone as a modem, there is a good description HERE, although I haven't tried to make it work. But why would you want to use telo as a modem? Wouldn't it be better to have a mobile net wifi sharing?