If you driving car go to the gym playing sport .. and any where that you can't carrying your smart phone inside but you still want caller who make a call to you can receive information about you example :
I'm cooking i'm driving i'm in the gym. .. etc

You just need install "Auto Answer Phone Call". It'll help you resolved that problems.

FEATURES :
With auto answer phone call you can:
- Auto answer incomming call by your voice record (audio file).
- reject a call and auto sent SMS to caller who's call to you.
- Record voice message from incoming call.
- Easy to enable/disable by widget
- Select contacts to apply
You just choose one of two features above.
- Add feature scheduled activities weekly (Premium version)
- Remove ads with Premium version
We'll update more features when we can.
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***NOTE***:
- When there comes an incoming call the app may not work correctly if there is any conflicts with other sound editor or call utilities (call recorder call blockeretc…)
- The app doesn’t support all devices and some of the supported devices will be required root permission on the very first run. If your phone’s been working fine with previous versions feel free to choose NO. We’re working our best to improve this.
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More app make by US:
Auto Call Recorder : https://play.google.com/store/apps/details?id=com.softtech.apps.autocallrecorder