This simple app will enable bluetooth on your phone when you receive or make a call so you can answer it on your bluetooth headset or bluetooth hands-free device.
This way you will preserve the battery life of your phone.
Note that it will not answer your calls automatically (this can be accomplished by enabling the auto-answer setting under the call settings of your phone).

REQUIREMENTS:
You should have your phone and your bluetooth device already paired.
Your bluetooth headset or hands-free device must support bluetooth headset profile (is most probably it will)

SIMPLE INSTRUCTIONS:
1. Open application.
2. Select default bluetooth device from the device selection list.
3. Select Active to activate it