Mobile premium services are the best known and most widely used form of mobile payment to date. They are essentially a method of electronic payment, a platform on which consumers can purchase content such as ringtones, games or news updates (generally via sending an SMS text message to a '19' number), that gets sent to their mobile phone and paid for via their mobile phone bill. They are often referred to as premium SMS or MMS, and are so called because customers are charged a premium for using the service, that is, they cost more than a standard SMS or MMS.