How to activate a Deutsche Telekom Gift Card key?

Activating a Deutsche Telekom Gift Card key is really simple, just follow these steps:

1. Purchase a Deutsche Telekom top-up code.
2. Dial the code on your phone.
3. Follow the prompts on your screen.
4. Receive confirmation of the recharge.
5. Enjoy using your credited amount for calls, texts, and data. 

The key is not working

If you have activated the key according to the guide but the code appears not to work, please check what type of error message you receive and depending on it follow the appropriate instructions:

• My key is Duplicated / Already Used. How can I proceed?
• My key is Invalid. How can I proceed?
• My key is region locked / can't be activated in my country. How can I proceed?
• My key activated a different product that it was supposed to. How can I proceed?
• The key I bought didn’t activate all of the content it was supposed to. What can I do?