We write to introduce ourselves as one of the largest exportes from China,of a wide range of mobile phone cards. Our cards are not as usual as your celluar card which include dual sim card ,16 in 1 card and phone directory backup. What dual sim card is that two mumbers can work on your cellphone at the same time, and they can swith online automatically, 16 in 1 card means that you can have up to 16 mumbers in one card and choose any of those mumbers whenever,wherever you are. These products will make you more convinient and economical and bring you a great market.