Hello Ed!
Besides the USB device I also saw another device with a
CAT5 jack on it. That has me thinking about using that
device in the place where the old DSL modem was plugged in
the Linksys Router. Using that CAT5 device I could use
either the XP or Vista PC as I used to do.
If you are thinking of this solution..
https://www.pcmag.com/how-to/connect-phone-tablet-to-internet- 
ethernet-cable
.. I don't think it will work for your situation.  The adapters  
depicted in the article are usually designed to bring internet  
*to* the phone.  But in your case, you want to tap into the  
internet *from* the phone.
I WANT to get back to doing 'computing' as I used to do.
Wifi or BT receiver/transmitter at your pc is easier.
-- 
  ../|ug
--- OpenXP 5.0.58
 * Origin: Mobile? ASIAN_LINK 
https://preview.tinyurl.com/y6rwskq (2:221/1.58)