Wanted: event when a phone number is added to / removed from a user

Hello,

my app needs to receive an event whenever a phone number is assigned to / removed from a user.

Is that possible? If so, which scope should I assign to the app? I have assigned phone:read:admin to it, but that doesn’t seem to be sufficient.

My current workaround is to poll all users’ phone numbers every ten minutes, but that’s not very satisfactory for obvious reasons.