Well, you can’t do it right now, but you will be able to in the future. Sofia Digital is touting a technology called Mobile Digitext, which is designed to sit alongside DVB-H digital TV services for mobiles. Which haven’t launch yet in the UK, sadly.
But anyway: the idea is you get traditional Teletext pages on your phone, either delivered alongside the digital TV broadcasts, or via your phone’s 3G connection. Why use Teletext when you’ll presumably have a full web browser in your phone? Presumably speed, in the broadcast model.
(Sofia Digital Mobile Digitext)
Mobile tv with teletext subtitles would be great for commuting in noisy environments. I’d want that.