The payment method "Zahl einfach per Handyrechnung” offers a simple and secure way to pay for digital content, for example in app stores, on game consoles or even the train ticket, via mobile phone bill or prepaid credit for all customers. This payment method from O₂ Telefónica is already available in all major app stores, including Google Play Store, Apple App Store, on game consoles, such as Sony Playstation or Microsoft Xbox, for all popular music and video streaming providers, such as DAZN, and enables customers to pay for their purchases easily and conveniently using their cell phones.

In addition, selected services such as e-vehicle charging or bike rental, e.g. Nextbike, can also be paid for by cell phone bill. In order to continuously improve the user experience of "Zahl einfach per Handyrechnung“ and to provide information on the product, the German mobile network operators started a joint initiative, called "Clean Market Initiative". Further information can be found on the website (in German) of "Zahl einfach per Handyrechnung“.