Motorola has unveiled a new music radio service for cell phones. The service also plays over car and home stereos. Dubbed "Motorola iRadio", it features 435 channels and would be sold by wireless service providers to their subscribers for between $7 and $10 per month. This is just a little cheaper than the satellite radio networks, which might provide a similar service for phones. The service may also be adapted for non-Motorola phones if carriers request it, company officials said.