Enid's phone receives a notification. She thought she'd turned off most of those … oh, huh, someone saying hello in that Bluetooth mesh networking app nobody ever uses, no wonder she didn't turn off the notifications for it.
"Hi, who is this? Are you doing okay?"
The obvious reason for someone to be on an app like this is because their internet connection isn't working and their Bluetooth is, so it's likely they have some kind of problem.