Earlier this year, CEO John Legere called out the other carriers for "Bullshit charges" like activation fees. Today, T-Mobile now charges $25 per SIM card.
-In the past, it used to be T-Mobile that included great features while the other carriers charged extra to add them. Today, Verizon exclusively offers 1080p Hi Definition and 10GB of mobile hotspot per line on all of their Unlimited Plans. If you want this with T-Mobile, you must add $10 per line to their standard Unlimited (low resolution) One plan. That makes T-Mobile more expensive than even Verizon for anyone getting 4 or more Unlimited lines.
Unless you travel globally frequently, paying more to get T-Mobile over Verizon does not make a lot of sense. I'm already hearing ads that they have at least one market up and running with their newest 600mHZ bandwidth. I have not heard anyone mention that Apple has any plans to introduce this bandwidth in their soon-to-be released new iPhones. That means it could be May of 2018 before Apple even supports this. Don't hold your breath!