Have not tried that yet, but I have heard putting phone on silent solves the problem. But it would be nice if there were a software switch to turn off sound. In fact, I thought there used to be a way to do it.
thats the only way to get it to be silent. the reason i asked was because i remember a long time ago i think someone bought a phone that was originally from china or japan and it would still make the shutter noise when it was on silent