2025-08-18 00:00:00 All the advantages of your service world now in one app! All information about your tariff always at hand. With our sim24 Servicewelt app you have everything important at a glance: access your bill on the go, book suitable tariff options or update your data. Never miss the latest special offers and tariff highlights again! Make managing your mobile phone tariff on your smartphone or tablet even easier with the sim24 Servicewelt app!