OK. I'm no lawyer but let's put this in a true perspective.
A) I buy an iphone. Not on contract. It's my property. I should surely be within my rights to seek repair from any source.
B) I buy a tin of paint. Not on a contract. I't my property. I can paint my living room walls bright pink with it.
It's MY phone and my paint.
Time that we had a big discussion about this.