I am having this problem where I have a lot of "interference" when using Shure 315 earphones with my phone but not with other earphones. The interference is a bit like white noise but is clearly influenced by the sound (i.e. it's a constant buzz when no sound is playing and it changes pitch when music is playing).
Further, it seems to come on whenever the sound port is 'activated' e.g. when I press the dial pad to produce a click, the buzz comes on, persists for a while and then disappears.
Does anyone have a solution to this problem? Thanks!