You can use this form for landline: https://www.telekom.de/kontakt/kuendigung/ausserordentliche-kuendigung#spi_852756

and this for mobile: https://www.telekom.de/kontakt/kuendigung/ausserordentliche-kuendigung-mobilfunk#spi_855606

Mark X there: Kündigung wegen Umzug ins Ausland

Thanks!

And where do I send it?

Hello again,

For the equipment (modem/router, tv box) should I go to a telekom store and give them back or will I receive an email with shipping labels?

You can obtain the return slip by stating your customer number and zip code at https://www.telekom.de/hilfe/miete/

Hello again,

Thank you all for your valuable and immediate help.

I managed to cancel the landline and tv successfully and returned the devices (router+tv box), but for the mobile even though I tried two times to cancel it seems that it does not cancel.

Do I do something wrong?

Thanks again.

Thank you @und3rd06012,

for our friendly phone call.

I'm pleased that we were able to clarify your mobile cancellation straight away.

Everything has already worked. You don't need to do anything else.

If you still have any questions, just let me know.

Kind regards

Kathrin

Thank you Kathrin for your valuable help!

Regards