If you rent your home phone from Eircon, simply call up 1901 and ask them to upgrade your phone to a cordless DECT (model: eircom 5010) and they'll send you one out in the post...for free !!!
Yep, you read it right...They'll charge you €0 for your nice shiny new handset (which even has handsfree on it).
If you don't rent your home phone from them and you've some old piece of crap (as I had) then they'll charge you an extra 2.50 a month on your bill for the shiny new phone (30 a year ain't too bad)!
I'd get in quick though as I doubt it'll last long (it is Eircon after all!)