How to get mobile internet usage and balance from telecommunication companies

Normally, in my country, mobile users have to text the wordy and complex codes to telcos when they want to know their internet usage and balance.

I'm going to build up an application which allows users can check there information at anytime when they open the app on their mobile. I do not have any clue about the telcos having any API service for that or have to make the business deal with telecommunication companies.

I did attempt to figure out the way but nothing has come up yet. Does any one have any idea for that.