Integrate twillio in android and iOS app

Hi I have an andriod and iOS app which is a uber like app and I want someone to integrate Twillio voice call in my apps such that it hides the orignal phone number of the user. This modification needs to be done in the following apps: [login to view URL] driver app [login to view URL] passenger app [login to view URL] driver app [login to view URL] passenger app I am looking for cheap price and fast work. The work done should be clean coded and secure.