Mobile phone content advertising is the promotion of ring tones , games and other mobile phone services. Such services are usually subscription-based and use the short message service (SMS) system to join up to them. Another method is broadcasting messages to the mobile phone's idle-screen, enabling the mobile operators or advertisers to reach millions in real-time. The advertising and sale of ring tones in particular has seen a massive growth in recent years , with some commercial breaks, particularly on music television channels and in motor racing (especially NASCAR , with Sprint Nextel as the series sponsor), being dominated by such adverts. Advertising in newspapers and magazines has also become popular.