I won't, but if the phone that it's connected to is a cell phone, I won't need power.
If your next question is going to be "but don't you have your own cell phone"?? I would answer: yes, but what if we have a babysitter who doesn't, or what if one of my kids has to call 911 when the power's out (and a host of other irrational fears that I have to deal with)