Multiline just means one line pays for all lines. The multiline account owner does not have access to your account or your usage info. Each line still has their own account. Only you can see your usage.
*The views and opinions expressed on this forum are purely my own. Any product claim, statistic, quote, or other representation about a product or service should be verified with the manufacturer, provider, or party.
Well they are getting reports on daily data from account owners login in account. It has a place showing how many lines are on account and also the home numbers on account with a check data selection under each one. If this is the case it violates privacy and I want out. Also there is no way to check if someone is tracking you your phone or if something has been dwnloaded to your phone. Security on these issues need to addressed I believe.