AT&T has dropped all data caps, waived any late payment fees, will not terminate service and has opened their WiFi hotspots to everyone.
Charter is waiving late fees, not terminating service, offering free service to households with students which don't already have service and opening their WiFi hotspots to everyone.
Verizon is waiving late fees and will not terminate service.
Cox is waiving late fees, not terminating service, opening WiFi hotspots to all and upgrading speeds on connections in their programs for low income customers to 50Mbs.
Comcast is eliminating data caps, waiving late fees, not terminating service, opening WiFi hotspots to all and offering 2 months of free service to those eligible for but not enrolled in their $9.95 per month program for low-income families. They are also increasing data rates for their low-income program connections.
Many other providers have also pledged to not terminate service.
I use Mintmobile (US) for my cellphone. They are a cheap provider. I pay $180 a year for 2GB of a data a month. They emailed the other day saying data is free for the next month.
I was pretty sure most US Internet vendors pledged [1] to "not terminate service to any residential or small business customers because of their inability to pay their bills due to the disruptions caused by the coronavirus pandemic."