Ay Yildiz is your affordable mobile provider for Germany and Turkey, offering simple tariffs that are cost-effective, flexible, and without any contract obligations. You can top up your credit, choose the option that suits you, and book it easily.

You have many options to top up the credit 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 calling:

• Dial 1155 and press 1 for top-up.
• Enter the 16-digit top-up number and confirm with the hash key.
• Confirm your entry with 1 and wait a moment 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, the top-up amount will be displayed on the screen.