I call BS...
I realize the story is specifically about T-Mobile, but overall it's about the "mysterious" charges that end up on peoples bills across all carriers.
I worked in Sprint's billing department (hell on earth, yes), and I dealt with these calls about 25% of my day. I was personally allotted $15 per call, that's per customer to refund these charges, explain how they got there, personally block them from happening again wherever possible, and then give a long lecture on how to prevent this sort of thing from happening again. And if it was more? "Hey, boss! I need you to approve $50 in refunds for this account!" "Okay, no problem!" Half the time the charges could be traced back to a parent letting their 7 year old play games on their phone without oversight, but we refunded them anyway. There are many different ways for these types of charges to get on a phone bill, and we always happily refunded them, blocked misc. services or whatever ever it took, and cordially thanked them for being diligent when it came to examining their monthly statement. The bottom line is, at least at Sprint, I never saw a charge that someone had to have blindly agreed to, yet we refunded them left and right anyway.
If you had the opposite experience with Sprint, it wasn't within the last 5 years (major reform) or you weren't routed to my department.
It's up to the customer to carefully examine every line item on their bill every single month and that's that.
I get the feeling this will get modded straight to hell, I hope at least one person with sensibility reads it first.