Can i change my iphone 13 pro max which i have vetrag it bei o2 for 2 years 6 months ago with 14 pro max or not ?

No.

Why 

?

Seriously? Why would o2 (or anyone) do that?

You can of course buy an IPhone 14 now if you want, but then you would have to pay for two phones.

Would you buy a 6 Month old used phone??

When you buy something, it's yours. How do you come up with the idea that you can give it back after 1/2 a year?
Only if you bought something over the internet you can return it within 14 days. That's all.

Ok So can i pay my remaining bill at once and finish this contract?

Ok thanks for your answer 
 

Can i pay my remaining bill all at once and finish my this 13 pro max contract?

Yes, you can.

But how Online or should i go to the o2 retailer store 

Online. The option should be available in meino2.

Thank you very much for answering 

one last question please 

i have signed up with my email in this o2 website but here i can’t see anything about my phone contract that how much i have paid and how much remains please where can i check this because i have contract without sim card and i also can’t log in or sign up with this email in mein o2 app

You need to register a new account with your contract number.

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