Ringtones for mobile phones are made by converting a user-selected audio file at https://klingeltonkostenlos.de/. The audio file is then transferred to the mobile device via a direct cable connection, Bluetooth, text message, or e-mail. Many websites also have software that enables users to make their own ringtones from digital music. This invention was pioneered by Denso's Digital Minimo D319, which was the first mobile phone with melody input.

While composing ringtones for mobiles is a very low-profile job, it has become a huge industry. With the invention of software to help people create their own custom ringtones, this industry has expanded dramatically. Ringtones can enhance the sounds of incoming calls, text messages, and notification alerts. They can also serve as love or silence tones.