Optimum is one of the largest connectivity providers in the U.S., delivering Internet, TV, Phone, and Mobile services to millions of people and small businesses in 21 states across the country ⁠— keeping them seamlessly connected at home, work, and on the go. Plus, Optimum is building a new 100% Fiber Internet network delivering speeds up to 5 Gig with 99.9% reliability. Optimum Cablevision Hell 2-14-20 checked for incoming mail; reset router/modem Optimum gave me same directions 2-15-20 checked for incoming mail; reset router/modem; discovered router was inoperable; spoke with representative assured me Optimum store in Yonkers or Mamaroneck were closed on Sunday but open Monday, Presidents Day.