hi i just have dropship 2 CVSCX-9301 Mobile Phone Watch - 1.4 Inch Touchscreen + Keypad and the 2 of my clients say that on the screen says 'no service' and they can not make or recive phone calls all the other functions of the product works fine the band on my country is 1900 so thats not the problem, somebody has this same problem?? how can i fix it i think is a configuration problem somebody can help me please thanks :)