A friend would like Wifi but found out they have a 7 year old cable modem

this SB5101

https://community.vodafone.co.nz/t5/Modems-home-Wi-Fi/Read-Me-Troubleshooting-Highspeed-Cable-broadband/td-p/171454


it doesnt have any WIFI on it.. how lame is that :)

I know you could use the single lan cable to another old ASDL router and use
that for wifi

but how easy is it for their vodafone ISP to upgrade that to a wireless router

and what is the cost..