IPhone repair/replacement policy?

My iPhone is broken, it has been proven that its not my fault, and i have to hand it over to telstra tomorrow to be fixed.

Will they give me a replacement iPhone whilst mine is being fixed?

Mum says they do because of something to do with sims and beause its not my fault. Is it true?

I live in australia btw.

If your iPhone has not been jailbroken and it's still within warranty then you should be eligible for a new one if it can't be fixed or cost of the repair given. Depending on the length of the time it takes to repair will depend on if you get a courtesy phone or not.