Available now from the App Store, the 4oD app allows viewers to catch up on the last 30 days of Channel 4 programmes, such as Seven Dwarves, Beaver Falls and Channel 4 News. The app can be used on iPhone models 3G, 3Gs and 4, along with the iPod Touch.
Launched after the revamp of 4oD on the Channel 4 website, the bespoke app was designed by the cross-platform specialists Nice Agency, who also created the 4oD app for the iPad.
Both apps now feature improved search functionality to enable users to more easily navigate the catch-up and archive content. They can both be browsed in 3G, but video playback is still only available with a WiFi signal to "ensure the quality of the viewing experience isn't affected".
For the first time, the apps will also feature a link to Channel 4's content on iTunes, offering the chance to purchase shows such as The Inbetweeners and Misfits.
Helen Walker, the 4oD product manager, said: "We're delighted to bring 4oD to our viewers with iPhones and iPod Touches, and to offer our existing iPad users an update to their app, with a new carousel and ability to now browse the app over 3G."
Nice Agency's joint managing director Ryan Hall added: "The whole point of having 4oD in your pocket is to give users access to their favourite Channel 4 content, whenever and wherever they are. It shouldn't take more than a moment to engage with the 4oD catch-up app, browse your desired content and start watching.
"It was vital that we got the look, feel and navigation right so that the multi-screen experience of watching content either on iPhone, iPad or laptop felt as natural as watching it on a desktop or television screen; as such, we invested a lot of time in prototyping and testing the app to get this just right."
According to figures released by Channel 4, 4oD attracted a total of 242 million programme requests in the year to the end of July, up 20.9% on the previous year's figures.