I can't understand why some people have given low ratings to this product. It works perfectly with blackberry, placing calls and talking is a breeze. For audio playback again the quality is excellent, loud volume, very clear. And the headphones are durable. I spindle and crumple and crush and throw mine around and they generally last for months. Not to mention that they do not suffer from the common headphone problem involving the wiring at the base of the headphones being bended internally and losing sound. These are so good, that even after binning my useless old blackberry I purchased a brand new pair of these headphones for my replacement Sony xperia. Highly recommended, you can't go wrong with these.