The content partnership, which will initially last for one year, enables 3's subscribers to watch live TV, as well as clips and highlights from ITV's hit shows.
The ITV content will be designed specifically for the mobile platform and will include highlights and behind-the-scenes footage.
3G handset owners, including 3's 3.2 million customers, will be able to watch
I'm A Celebrity's Bush Tucker trials on the handset before they air on
Charles Allen, chief executive at ITV, said: "ITV is the home of some of the biggest entertainment programmes on TV, with millions tuning in to see the latest series of I'm A Celebrity following on from the great success of X Factor.
"This agreement allows us to talk directly to the company's 3.2 million customers, and generate revenues from 3G-enhanced extras like streamed video and clips."
Geoengineering on the sea floor near glaciers would form a new ice shelf to prevent melting
Alterations in capillary blood flow can be caused by body position change
Curiosity rover is in 'normal mode' but not transmitting scientific data back to base
NatWest outage comes a day after Barclays' IT systems shut out customers and staff