Originally Posted by phillevy

Has anyone had any direct experience of a repair being refused? I seriously doubt in practice that it would be a problem unless the modification had directly caused the malfunction.
There are so many things that you can do to modify a smartphone's software - just look at all the apps that can be legitimately installed - it is like a PC manufacturer refusing to honour a hardware warranty because it didn't approve of the software setup. I would be surprised if a repair department even bothered (or had the time ) to delve into things like this. Also I have never been directly told by my provider about any exceptions to my warranty.