Hello @Tinay ,

Welcome to the community. 
If you want to cancel your contract early because you are going abroad, you can do this via the following link. Send the completed form back to the address provided. For the cancellation to be accepted, we need the following documents from you:
- the deregistration certificate of your previous place of residence
- the registration certificate of your new place of residence abroad
alternatively to the registration certificate, a confirmation from your employer or landlord
(e.g. employment contract, rental agreement)

Kündigung Umzug ins Ausland

Best regards,
Maria

Thank you for the reply. What if I don’t have a rental agreement because it’s our own family house? And for work contract, I am still searching but it’s gonna take some time. What happens to the phone? And how much should I be paying?

You can cancel the contract Only. when you sent all the relevant documents, the contract ends 1 month later.

but not the myHandy iPhone 13. 

Hey @Tinay ,
I wanted to check in with you.
Did you manage to cancel your contract and did the Link sent by o2_Maria help?
It is also possible to cancel if you can meet one of this requirements:
- the deregistration certificate of your previous place of residence
- the registration certificate of your new place of residence abroad
Contract Cancellation moving abroad

What happens to the phone? And how much should I be paying?  

Please check Mein o2 to dissolve and pay off your installment plan.
If u have further questions, do not hesitate to ask 
Grüße, Matea