Ay Yildiz is your affordable mobile service provider for Germany and Turkey. We offer simple plans that are cost-effective, flexible, and without any contractual obligations.

Top up your balance, choose the option that suits you, and book. You can now purchase and use credit.

You have many options to top up the balance on your Ay Yildiz prepaid card. Use vouchers or credit cards from O2 or Blau, which are available in many supermarkets.

Here's how it works:

1. Top up by call: Dial 1155 and press 1 for topping up. Enter the 16-digit top-up number and confirm with the hash key. Confirm your entry with 1 and wait briefly for the top-up to be successfully registered.

2. Top up using a key combination: Enter the following key combination: "104" + 16-digit top-up number + hash key. Then press the call button. Shortly after, you will see the top-up amount displayed.