· Approved for Cox, Spectrum and Xfinity internet along with other US cable internet providers. Is NOT compatible with ATT, CenturyLink, Verizon, Frontier or other Fiber Optic, DSL or Satellite internet service providers.· Does NOT support cable digital voice service.· ARRIS Surfboard SBG6950AC2-RB DOCSIS 3.0 Cable Modem & AC1900 Wi-Fi Router , Approved for Comcast Xfinity, Cox, Charter Spectrum & more , Four 1 Gbps Ports , 400 Mbps Max Internet Speeds,- REFURBISHED