Expect to pay more for a new plan unless you decline.
Net neutrality - Wikipedia
Britain announces stricter visa measures to reduce net migration
T-Mobile's Forced Plan Migration: How That Impacts Your Next Bill and How You Can Opt Out - CNET
How To Keep Your Current T-Mobile Plan & Not Be Forced Migrated To The New More Expensive Plans
T-Mobile moving some customers to pricier plans unless they opt out
Planet Thunderbird
Breaking: T-Mobile Will Force Customers Onto Newer Plans Unless You Opt-Out
Here's How To Opt Out Of The T-Mobile Forced Plan Migrations
T-Mobile Reverses Decision To Force Migrate JUMP! 1.0 Customers