View credit and adjust bundle With our Mobile app you can view all the details of your usage at a glance. And if you want to adjust your bundle because you need more data, you can easily arrange that. Or do you want to buy an extra data or calling bundle at home or abroad? This can now also be done easily in the app. View your invoices Do you no longer remember whether you have paid your last invoice? View your latest invoices, payments and specifications in the app. Information abroad Do you need help abroad because you don't know whether you can call from your bundle? Check “service” for the latest rates and find answers to your questions. You can also easily switch your voicemail off or on again here. Still have questions? Then view the frequently asked questions on delta.nl/mobiel or contact our customer service. They are happy to help you.