I just noticed this today when checking my email right after waking up. The screen of the E61 buzzes when it’s on full brightness, when it dims you can barely hear the buzz, and when the backlight is completely off you don’t hear anything.
Now I’m a little bit paranoid, so I’m asking you guys, does this happen with your E61 or E62? You really have to put the phone against your ear to hear it. Then again it might be just me, I can hear light bulbs and dog whistles so I’m a bit abnormal in that respect.
UPDATE: After doing a few experiments I realized what was happening. I first noticed the buzz in the morning, meaning I was laying in bed, meaning it was dark in the room, therefore it was the backlite keyboard that caused this faint buzz. When I was using the phone outside or in my brightly lite office, no buzz. I can’t emphasize to you people tho how sensitive I am to high frequencies. Call it a gift, a mutation, whatever, but I can really hear those high notes that would otherwise be unidentifiable by most.