Answer
An example question is: How many times a day do you send texts using your cell phone?
People who have a cell phone only will give a much higher number than people who have a landline only (since landlines cannot send texts).
Work Step by Step
An example question is: How many times a day do you send texts using your cell phone?
People who have a cell phone only will give a much higher number than people who have a landline only (since landlines cannot send texts).
