Phone Calls IPhone 5, 16GB black

Hello,

I have a big problem with my telephony.

When I call someone to hear my over like a tin can, the conversation is interrupted at one time or sounds choppy.

I'm pretty annoyed so, I pay a lot for a Iphone5 but I can not make calls ...

What is the logic in this whole story?

Can someone please explain to me that Apple's ...

I'm from Germany and I run here an expensive contract for one of the largest network operators ...

I chose my new contract with the Iphone5 16GB sw what here in Germany without contract costs almost 800Euro, it is not ok that you get an opinion about this issue ...

If you ask the Telekom is a problem with Apple, Apple now I ask, what's the problem?

Softwear error missing an update or even a production problem?

I would finally have an answer ...

greeting