termination of the contract

Hello, unfortunately I had an accident at work and I have to leave Germany. I have been dismissed from my job and have to leave the company accommodation on October 5. On September 30, I am going to leave my place of residence. I have a 24-month HomeSpot 5g 100mb/s contract with a rented router. When going to an o2 store, is it enough to return the router with the card and show the check-out form from the place of residence? Unfortunately, I have a problem with registering in a new country because I don't really know where I will live. I have to stay in a friend's apartment and then look for an apartment on my own.