It works perfectly fine in the US on Metro by t-mobile. The sonic character of the SHP9500 is midrange-centric, I would say, but extends quite well to bass and treble ranges. They are build to last and the sound quality is simply amazing. Note how loose they look after one wear versus multiple uses on my black ones and the visible looseness on the white sock. Getting a couple more. Was advertised as being a used size 6. This phone is amazing and super easy to set up. I will keep looking for a quality kind of Urbanfind combined with ($25)Teva fit, at a Urbanfind cost, under $15. Ive had the original pair I bought for two years and they still sound as good as the day I bought them. Lo que me enviaron ,no es para nada lo que compre, es un modelo distinto