Take a random tween, age 8-12, place them in front of a rotary phone and observe at the blank stare of bewilderment. Yes, gone are the days of the landline, pushed aside by the next wave of technological advancement. Mobile phones are fast displacing landlines in many homes; accompanying this movement is the fact kids regularly use and know how to use these cell phones. The mobility of cell phones means you can be anywhere and have the necessity, or should I say the convenience, of a phone.Cellu.