I just found some more information from a German website, which proved my suspicions. I think my model do is a counterfeit one, and I will try to return it.

Hello Headfiers,   A couple days ago I ordered a Koss Portapro. Because I know there are a lot of fake Portapros, I wanted to buy it directly from Amazon and not through another seller. Now I received them, but I am not sure if they are the real deal, and now I can't remember if it do was...

The device is going to RMA today, and I'll see what happens. I talked to another owner of the device, and he said there was nothing wrong (to his ears) so this might be bad shielding or something like that. I don't know why it happens precisely, I never had this issue before.

Quote: I tried using two types of earbuds, one Monoprice and one Sony, and with my "main" headphones the Technics RP DH-1200. With all the noise is noticeable, and switching to airplane mode doesn't change it in the slightest. 

I managed to make a recording in which the noise in audible from a recording. I got the a free MP3 audio book from The Call of Cthulhu and played it at the lowest audible level. Then I recorded it from minijack out on the cell phone to line-in on my netbook. I made the recording level high in...

  I happened to have a song in my library which has a couple minutes of no sound at all, so I thought to use that for a quick test. I do not have superb audio equipment for recording, so when I tried to record the noise and played it back again, it was barely noticeable, but with headphones...

Quote: The "sounds" I hear, as described in the OP, are also there when the music is paused/stopped. The music itself were FLAC files converted to q1.00 VBR AAC for this cell phone. Another user with the same phone already described the same problem. I'm sure this is hardware related, as in...

Quote: Thanks, I voted (starred?) the Google page, added my comment there, and emailed Sony to see if they can do anything for me. I won't be giving up the emailing Sony until I've at least have a reply from a developer.   I also rooted my device, isn't it possible to "inject" a driver...

Hello people from Head-Fi,   Yesterday I finally acquired an Android phone, and was really excited with it. I loved it, until I plugged my headphones in, because then I had the feeling as if I had plugged in my headphones in a budget mp3 player from 2004. The Xperia Miro does everything...