 An All 4 app for the iPhone and iPod Touch allowing a 30-day catch-up was released on 2 September 2011, along with an update to the iPad app.Both apps support search functionality to enable users to navigate the catch-up and archive content.They can both be browsed in 3G, but video playback is still only available with a Wi-Fi signal to "ensure the quality of the viewing experience isn't affected".