Android App to take over Phone / Calls

Avg Bid (USD)
Project Budget (USD)
$30 - $250

Project Description:
I am look for an Andoird developer who would be able to write an app that runs in the background and takes over the normal phone system of Andoird.
I can look the same but will have addtional features.
The app will load on incoming and outgoing calls instead of the standard Android phone system.
You must have the ability to control the phones microphone.

Bid and message starting with 'Call' to be considered

Skills required:
Android, Mobile Phone, Unity 3D
About the employer:
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