Ay Yildiz is your low-cost mobile phone supplier for Germany and Turkey, offering simple tariffs that are low-priced, flexible, and without contract commitment. You can top up your credit, choose the option that suits you, and book it easily.

You have many options for topping 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 briefly until the top-up has been successfully registered.

2. Recharge by key combination:

• Enter the following key combination: "104" + 16-digit recharge number + hash key. Then press the dialing key. A short time later, you will see the recharge amount on the display.