We Have T-Mobile and speeds have improved in the San Diego area to a decent level. I pay $25 extra for unlimited LTE hotspot data - and at times have up to 4 iPads surfing or streaming off my iPhone 7
. It was a wise move because the “free” Beacon WiFi in the marina was crap. Total bill is $85 for two phones and unlimited LTE hotspot functionality.
I can’t speak to ATT