Customers are being notified that their service plans need
updating to subscribe to a tethering plan, and that they will be
automatically subscribed to a DataPro 4GB package that costs an
additional $45 per month if they continue to tether. In the email,
AT&T also notes that if customers discontinue the use of
tethering, no changes will be made to their plan.
That’s not quite right. It’s not $45 “in addition” to whatever you’re paying for your data plan now — it’s $45 instead of your current data plan.