So giving Cox your router sn# is useless. You need a modem, and more than likely what is going on is they removed the cox phone modem and added the other information incorrectly.
- If you have your OWN modem, take a picture of the SN and MAC ID, and contact Cox and have them verify the numbers are correct.
- If you are using the phone modem for internet and have no phone service, be advised, yuou are now RENTING that modem, and you need to contact Cox and have them verify they still have the phone modem provisioned for your internet.
Either # 1 OR #2 WILL fix your problem.