Implementing digital or even analogue UHF or VHF TV on a mobile telephone handset would be quite challenging anyway because of the antenna design problem. Simple dipole or unipole antenna's are poor performers and would need line of sight to the UHF transmitting antenna, this is why hi gain Yagi directional antenna's are employed for good TV reception especially for Digital transmissions which suffer from the cliff or brickwall effect. High gain low noise GaAs MESFET UHF amplifiers could boost signal strengths to useful levels but these are still very expensive. Even the US Digital TV ATSC standard does not have mobile devices as part of its specification. Moving over to the European DVB-T2 and DVB-H standard would be extremely expensive to implement when the ATSC standard has just been implemented. Having mobile TV broadcasts in the US sounds like a nice idea but would be just too difficult/costly to implement. If you want mobile Digital TV from terrestrial then you are going to have to lug around a Yagi antenna, high gain low noise preamp, power supply and a compass so that you know which direction to point the Yagi. Thats why you don't see digital broadcast TV already on mobile phones, simply because the form factor and power requirements are unfeasible for a mobile telephone handset.

I wouldn't mind a Mobile phone handset with DAB Digital Radio receiver built in though along with a built in WiFi 3G Access point (so I can watch and listen to hundreds of IPTV and Internet Radio stations on my Archos player).