Looking elsewhere online "Usually 30 days after the due-date, they will text you and tell you "your service may be disconnect for non-payment" If your still having trouble paying call customer service and ask for financial services and they will allow you to extend or make payment arrangements."
but call customer service now and make arrangements. try this number
Talk to a Human
Press 0, then 0000 and 0000 when it asks for the last four digits of your social security number.