Its a pocket range device from Samsung. I bought it from Amazon for me. Really nice working, a better camera surrounded lighting with selfie mode. What I like most is s bike mode. It’s turbo speed technology is awesome. A fast machime from south korean company. With sufficient inbuilt memory, importantly you can expand it too. I own a silver coloured device. I can easily use a whole day with mobile data connection on. Battery life is amazing. Both sim card slots are 4G. Specially best LTE network.