Dear person.
A single toilet bathroom is not your personal phone booth. My dock isn't either, for that matter.
Unplug and go back to work. If your boss doesn't let you use it in your area, and that's why you;re hiding in there pretending to go to the bathroom? Tough shit (what are you doing chatting on the phone to your friends, anyway?). Some people actually need that bathroom to pee and poo in. And my dock is not 'safe'.
(Please note that I'm aware everyone at some point ends up taking/making personal calls at work--hell, I've done it. In fact, this is personal time right here.
But when you take up the bathroom for 10-15 minutes so that you can talk about basically gossip? You need to GTFO.)