There are two kinds of in-store phone upgrades. There's the kind where you walk out with exactly what you agreed to pay for, and there's the kind where you get home, check your invoice, and start doing math that doesn't add up. A T-Mobile customer on Reddit recently experienced the second kind, and his story is frustratingly familiar to anyone who has spent time in a carrier store lately.
What Happened

As reported by PhoneArena, the customer said he declined Protection360 three separate times during a visit to upgrade his iPhone. Three times. That should be the end of the conversation. Instead, another employee came out partway through the transaction to finish things up, and when he got home and looked at the full invoice, the insurance was already on it. So was a 20W charging adapter and a basic screen protector, which he says he never agreed to buy.
How It Slipped Through
He admitted he didn't catch it at the time. He uses a shared account and pays back his portion of the bill, so he wasn't scrutinizing the full breakdown in the store. He also had other commitments and needed to leave. The moment it clicked was the next day, when he received a message thanking him for adding Protection360. At that point, it became fairly difficult to write off as a misunderstanding.
Why This Keeps Happening
T-Mobile retail staff are evaluated against monthly performance metrics that lean heavily on revenue tied to initiatives like Protection360. The Un-carrier Leaderboard, which ranks store performance, reportedly gives insurance sales significant weight. In plain terms, the system rewards selling Protection360 whether or not customers actually want it, which creates a pretty obvious incentive problem. This isn't a new complaint. It just keeps coming up.
One More for Good Measure

Another customer in the same report said a similar attempt was nearly made on his account. That experience was enough to make him switch to Xfinity within two weeks of joining T-Mobile. One data point, sure, but it's not an isolated pattern.
What You Should Do
The takeaway is boring but necessary: read every line of your invoice before you leave the store, and check the follow-up confirmation messages after any upgrade. If anything appears that you didn't agree to, you can contest it, but the window to do so cleanly is right there in the store, not the next morning. T-Mobile offers a 14-day return window on devices, which at least gives you some recourse if things go sideways.
The bigger question is whether T-Mobile ever meaningfully addresses the structure that keeps producing these complaints, or whether the occasional bad PR is just considered an acceptable cost of doing business. Given how long this has been going on, you can probably guess which way that one is leaning.