I've just upgraded from a 4s to a 5s. Previously on the 4s I could download a program on BBC Iplayer when connected to wifi and then watch it back at my leisure. Now on the 5s I can download the program in iplayer but when I go to play it it buffers for 5 minutes or so and then tells me it can't be played. If however I am on wifi it will let me play the downloaded program. What has changed betweed my upgrading between the 4s and the 5s - think there must be something I've not ticked somewhere. I have downloaded and reinstalled the Iplayer app a number of times and have tried downloading various programs but still get the same problem. I have also tried restting my network settings - again this makes no difference.
