The deal will provide access to home TV channels on mobile handsets through 3's newly announced X-Series service which promises true mobile broadband.
This is the first time that Sling Media, makers of the Slingbox, has partnered with a major mobile operator.
SlingPlayer Mobile delivers home TV on mobile handsets using standard 3G network connections.
Any programme that can be watched at home will be viewable through Slingbox and compatible SlingPlayer Mobile software pre-installed on two new handsets, the Nokia N73 and the Sony Ericsson W950i.
The service includes support for terrestrial, Freeview, cable and satellite TV.
SlingPlayer Mobile also lets customers control their TV recorder at home to watch recorded shows, pause and rewind live TV or even queue a recording when away from home using the handset.
Blake Krikorian, co-founder and chief executive at Sling Media, said: "The availability of SlingPlayer Mobile for 3 customers is a major breakthrough in mobile TV viewing.
"Customers can now view all the programs they love to watch at home whilst on the move via their mobile phone."
Orb, which provides similar functionality to the Slingbox through a home PC, will provide 3 customers with mobile access to digital media stored on the PC.
Joe Costello, chairman and co-founder of Orb, said: "3 is the first mobile media company to give their customers the freedom and choice to use the mobile internet in the way it was intended to be used."
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