Stock Net app for iPhone and iPad

Application idea
The idea of the application is to take extra balance and Internet data of mobile users Example :-
If a person traveled a country and bought sim card from the same country and when returning to his country always throws the sim card without taking advantage of them, but through the application can sells the remaining amount of the sim card on the application and the application sells the balance to another user of the same company and the seller has a balance with the application can use it in his country or in all over the world .
Application mechanism
Easily any user carrying smart mobile, whether iPhone or Android can download the application through the store
After installation, it easily records data, name, country and phone number or more. After the registration process is complete, there are 3 services available which are transfer / purchase / sale of credit or data
Transfer: allows the transfer of credit / data to a known person you have a free service only once you enter the value and the number of the transferee
Buy: The user request to buy credit and very easily enters the customer a credit value of 5 riyals to show him that he will pay the value of only 4.5 riyals for the process and after confirmation of the task ends once a person has extra balance.
Sale: Allows the user who has extra credit to sell and very easily record the sale amount to be 5 riyals to show him the actual value which will get it 4.25 riyals. In case of a pre-order process ends within seconds or wait until the user requests the balance.