I remember how it was like when I was a teenager, and how the home phone was crucial to staying in touch with my friends. During that time, we only have one home phone and there were 5 of us siblings. We had to practice restraint and courtesy by taking turns with the phone.
Unlike me as a teenager, my kids have wifi and a plethora of gadgets that allow them to be socially connected all the time. And they don't even have to concern themselves with taking turns because their gadgets are exclusive to them.
I have a 16 year old daughter, a 13 year old daughter, and a 12 year old son.