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Are there additional Call Answer and End options on my Samsung Galaxy S® II?
Yes, see information below on additional call answer and end options for your device.
Open the Phone application, and press Menu > Call settings > Answering/ending. You can set your device to answer calls using the Home key by marking the checkbox next to The home key answers calls. You can set your device to end calls using the Power/Lock key by marking the checkbox next to The power key ends calls.