No kidding. Just started happening to our family.
Four phones, two teens, between the new plan and the spreadsheets Verizon allows you to download we can’t tell who’s “using up the plan.”
But it’s gotten so out of hand I’m seriously considering another cell service provider.
I have the Verizon app and it shows exactly how much data each line uses. You can also set up each phone to get text alerts when you reach 50%, 75%, and 90% of your monthly data plan.
Sprint has infinite data for $60 a month.
AT&T tells you exactly how much data is used by each phone - on your bill, and via an app while the month is still in progress.