Just received my Herotab knockoff and as a total computer ignoramus I'd like to know if anyone can tell me why the tablet won't let me tether my cellphone to it so that I can get 3G service on it. And also is there an app that I can download so that it will become a Bluetooth enabled device? Also the tablet doesn't recognize my microsd card, it sees it but doesn't read it. Do I have a defective tablet? Thanks for your help.