The annually accumulated data volume is retained as long as the contract exists. The tariff can also be combined with a discounted end device as a bundle. Alternatively is the Promotional tariff without additional costs available as a flexible version that can be canceled on a monthly basis. A one-off connection fee of EUR 39.99 applies here. This does not apply to the runtime variant in August. O2 Customers with an initial tariff that is valid for the Combo Advantage entitled to pay only 19.99 euros per month. Young people and the 60+ generation also receive a 10 euro discount on the basic fee. Existing customers who are in the O2 Grow want to change can get advice on the hotline or in the shop.