Why do HTC do this? Basically the end of the headphones has 3 lines, 1 for left, one for right, and one for the built in mic on the supplied headphones, FM antenna is in the mic, meaning if you use any other headphones without a mic you won't get reception. Why? No other manufacture do this, and to prove this, if you have a HTC phone, using any standard headphones without a mic, pull it out slightly to the first dimple, this is the one used by the mic, you will get excellent signal.