Dial a number on smartphone app

Question

We are currently prototyping an application that will have a version for android and iPhone systems. On a user interaction, The app is supposed to start a phone call to a phone number, but because of internal security reasons the user is not supposed to see the phone number. I am aware of the fact that it is possible to tell the OS which number to call, but is it possible to hide the number from the user?

Answer 1

No. I'm curious though, why would you want to do that?

A possible solution (depending on the 'why') is: have the device connect to a webserver over http telling the server what the phone number is. Then make that webserver call the phone from a 'hidden' number. The webserver has to be connected to some dialing machine obviously.