Hallo @user_ea3fdc 

just wait for a just informed Teamie of the @Telekom hilft Team
Greats

Waage1969

Hello @user_ea3fdc, your contract will be canceled to the end of the contract term. If the new tenant wants to make a contract, you have to move your contract to your new apartment first. If we can't provide your current contract to your new address, you have a special termination right. 

Please note a call back number and time frame I can reach you best to your profile and give me a short feedback after you have done that, I will call you and we clarify it.

Kind Regards Wiebke 

user_ea3fdc

I tried to cancel my Festnetz contract about a week ago because someone else is moving into my apartment.

This might be a motivation - but it is not a legal justification for a cancellation of your contract.

You can cancel your contract

• ordinarily ("ordentliche Kündigung") to the end of the minimum duration ("Mindestvertragslaufzeit"), or after minimum duration within one month after cancellation
• special variant ("außerordentliche Kündigung") due to e.g.
  - you move abroad (foreign country)
  - you move to a different appartment and order also Telekom to move the contract to the new location, but Telekom tells you that they cannot deliver there
• you move to a different appartment where there is a person that already has a Telekom contract, then Telekom offers on a voluntary basis to agree in an early cancellation of the contract