Cell Phone a Modern day leash

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i really cannot understand why cell phone user MUST answer their cell phones when it rings. I see people using cellphone while driveing, eating, watching tv, jogging, etc etc. before the invention of cell phones he world was doing fine. but now it, looks like everyone decide to go to the pet store and buy a leash for themselves. ANYONE can tug at the leash and the cell phone user would answer. switch it of already!