“T‑Mobile will never change the price you pay for your T‑Mobile ONE plan.” That was the promise. The Un-contract. The whole reason millions of customers picked the magenta team over Verizon and AT&T in the first place. Now T-Mobile is retiring legacy 3G and 4G-era plans — Magenta, ONE, Simple Choice — and automatically moving customers onto “modern” 5G plans at higher monthly costs. Billing changes hit mid-July for the current wave. The company that swore it would never surprise you with a rate hike just sent the notification.
It definitely is, but from their perspective I think the average price is logarithmic towards $30 or so dollars? I did the logic at some point but its 2am where I am now and my brain is mashed potatoes so I forget. Either way, yes it is pyramidical, but for a limited time and a cap on gain, which changes the overall structure slightly.