It works perfectly fine in the US on Metro by t-mobile. So far I have only tried these on as unfortunately the weather turned after I received them. I needed 2 and it was nice that theyre sold as a pair. I personally will not purchase this style again. I love the microphone- no one has complained they can?t hear me. Another two rounds of partially relevant requests and I finally got an RMA. Looks like it was made for that spot. Seems well made, but I knocked off one star due to being backwards. La vida de la batería es exelente además carga completamente en poco tiempo I dont know if mine were just defective or they are all like that.