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So I started to hear a noise on my headphones which I didn't know where it was coming from. It wasn't much of a noise but a regular sequence of "beeps", seemed like 8bit sfx. So I started moving my cable around and it turns out that if I put the headphone's cable under my phone at a specific spot I can hear the noise. Seems like some kind of interference, so the first thing that I thought of is the NFC sensor. So I remembered that an app would detect my credit card (which has NFC) if it was close to the back of my phone, so I put on my headphones and put the cable between the phone and the credit card and voila, the sound changes. It only works if the headphones are be plugged in though.
Idk why but it think this is really cool. Just wanted to share :)
rant
interference
headphones
nfc