Yes, there is an available Ethernet Port on the back of the Telephony Modem. Plugging a computer, a router, or a device that supports internet with an Ethernet connection into the Ethernet port on the eMTA will allow you internet access. Customers that don't have a router also have the choice to rent a Single-Band Gateway Telephony Modem for an additional $6.99 a month.
1.connect your own router to the "free" telephone modem. No additional rental fees and gives you WiFi via your own router.
2. use the "free", included with telephone service, modem for phone only. Then you can buy your own modem and router for internet. You don't have to rent a Cox phone gateway. Just have Cox provision the phone modem for phone any your modem for internet.
No lies here, if you want Cox to do WiFi for you then you have to rent. But, it will work with the included modem at no additional cost ... your option.
There is also the 3rd option of obtaining/renting a phone/internet/wifi gateway like the Arris TG2472. I say obtaining or renting because I am not sure if Cox charges for the gateway if you have phone service. If you have experience with networking, I would suggest getting your own router for performance reasons, but there is the option.