Broadcasters compete to put TV on cellphones

The digital switch is the end of one TV era, but broadcasters and device companies hope it's opening up another. Their vision for the future: a world in which we access live television not just on big screens in our living rooms, but also on cellphones and computers and in cars. On Thursday, when stations will be required to broadcast through digital rather than analog signals, some companies will use the broadcast spectrum freed by the switch to transmit live television to cellphones and other portable devices. Shows and live video clips are already available on some phones, but this heats up competition as broadcasters and cellphone companies vie to turn the feature into a must-have.