I need to develop an application for windows ( xp,seven, vista) that connects to
3 phones via usb cables ( 3 gsm operators, each phone contains one sim for one operator)
and that sends USSD comands :
1) to check the balance.
2) to send prepaid credit ( for each operator).
3 ) to save customers in a database, and checks the maximum authorized credit for that
4) to save all transactions, in 3 different excel sheets.
5) to allow to add other ussd comands, for these 3 operators
4 freelancer đang chào giá trung bình $469 cho công việc này
Hello I am interested in your project. we are working on this project form past few [url removed, login to view] will like to handle to your project. Thanks