For 2 month or so, my 6 months old iphone 4 (not jailbroken) started to make some weird noises. I hear loud scratching noises coming from the speaker (also from the earphones) during a call. Today while talking to my father, i realized that this noise appear and arise when the opposite side is silent. I don't get what's wrong but this may be a clue for someone with a similar experience. Since this problem began, i've installed updated latest ios's at least two times.*
Does anyone have any idea?