Sony Ericsson Z520 / Z525

Phone manufacturers and service providers have been pressured to make it so the camera sound cannot be disabled. This is to prevent taking the phone into naughty places and taking pictures silently.

The problem with how easy it is to hit the button is well known and the only fix is to use the leather cover (which is of poor quality) or some other holster. I still managed to hit the button sometimes in the leather cover, but so far the plastic clip holster seems to be better (stays better on the hip, doesn't really stick out enough to catch on anything).