I had no idea...
Ive had my iPhone almost a year and had no idea the headphones that came with it had a mic and button! I dug them out of my junk drawer (still factory wrapped) and had to laugh at myself bcuz I had no idea those plain headphones had some function. Ill continue to use my bluetooth stereo headset but its good to know I could use these to control my music/phone calls if the bt headset ever has a dead battery.
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Secrets for iPhone Lite - Tips & Tricks