If you don't have a cell phone you are correct, but this day who doesn't? If you are home, you can use your "home" cordless phone to make and receive calls. If you are away, you have your cell phone with you.
For some that may not make sense, but for many (most?), it works great. We only keep out landline for the home alarm reporting service. One day I'll get an internet phone service and get rid of the TW bundled phone. It's just not that much money or big of a deal to make it worth it right now.
So this thing responds to any cell it is mated with (more than one)?
Mine can pair with two cell phones. Haven't paired my wife's yet./
How does it decide which one to use with an outgoing call?
Haven't disconnected from the land line yet, so can't answer the question. Now I can. On the handset
the word 'Cell' appears in the screen. By hitting the button under 'Cell', the cell phone is
selected for the outgoing call. As I have only one cell paired, only one shows up. If I had two
paired, I'd probably (I think) have to select Cell 1 or Cell 2.
Please keep asking these questions. I'm learning more and more.