Whats broke Modem or Router?

really thats a newer model? i figured it would be old cause we have had it for like 4-5 years and have not got a new one

i just updated the firmware on the linksys though and i tried just the modem but it wont work without either the linksys or the phone box connected to it besides i need to have the phone box connected cause the phones in the house wont work otherwise