I’ve had the same T-Mobile family plan since…I actually don’t recall. 2011? $25 per line for 4 phones. It was 2GB of 3G data per month, with a promotional bump to 4GB that they kept extending until it was permanent, then LTE data, then 50GB of LTE before it throttles down. It’s plenty fast, so no real need for 5G speeds, especially since most activity is on our home WiFi.