GS3 automatically answering incoming calls Why is my GS3 automatically answering incoming calls. I am not using a headset/bluetooth.
The phone can be in an entirely different room when a call is automatically answered.
Is your Settings > Language And Input > Voice Command for Apps 'On'?
Sometimes it picks up something in the background and answers the calls.

If turning off that doesn't work, try to do a factory reset on the phone.

Unfortunately, if even that doesn't work, you will have to get it inspected at a Service Center.