I have 2 phones on my plan. If someone uses the Apple ID to any other phone/account to use my data or theirs?

I have 2 phones on my plan. Me and my son, I noticed that his use of data was riding way, actually on the 10 GB.  I finally find out of his girlfriend has his Apple ID and password and remains connected to his account.  Not happy to know that none of my text conversations are private, she received all her messages too!  She has somehow their Apple ID interconnected.  Is this using our data? She uses my data on my plan when it is connected on his Apple ID from his phone?

If it uses the same account as yours while it uses your data. But if it is recorded in account of another person who does not use your data.

Tags: iPhone

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