Linksys G Broadband + Extender

When I bought my Wings Phone from T-Mobile I had no idea the problems I would run into.
In order to have a house phone from T-Mobile, I had to give up my N-router and buy a Linksys G-Broadband router with 2 phone paths. After a week, the phones stopped working. I must have spent 10 hours with the tech on the line before the fact that I was connected through a cable modem was requested. After that we reset the cable modem and nothing happened, until I remembered it had a battery backup. Took the backup out, reset the modem, reset the router, flipped the phones, and by magic the phone service returned. I called them back to explain that asking about the kind of cable or DSL modem and thinking of battery backups might be a useful addition to their database.
Eventually, my portable phone’s Wifi active sync stopped working (if it ever did) and the Mackintosh wireless connection stopped being able to pick up Gaby, my network name. Called T-Mobile who immediately transferred me to LinkSys and after 4 hours of intercourse with the computer (they took it over using the internet) and with the Mac fixed it so that all 4 computers (including my portable phone) would work. Of course they changed the name of the network to Gaby 1 so that the extender provided extensions to Gaby which did not exist, and the router provided Gaby1 which could not be heard.
Today I called back to set up the extender which refused to respond to internet (192.168.1.240) and the first responder told me to reset my router. Since I was on the phone with him over the router, we got disconnected, and worse, I lost my home phone.
A second call initiated a 2.5 hour trek that ended with everything working on Gabi1 (since the Mac had been set internally, I did not want to change it back to Gaby.)
All told I spent the better part of three days to get my network of 1XP, 1Vista and 1 Mac working properly and in unison.