Freddy, I travel a lot for my job, and I carry two cell phones, one for my work, and one for my "life". I never have issues with my personal cell, (Verizon), great service, but my work (Nextel), I can talk cell, or direct connect cross country no problem, but if I'm in places in Maine just outside of Portland, it dosent want to work.
Bottom line is, I can go without a landline, but never without a cell. As new generations get old enough for phones, studies show they wont ever have landlines, but only cellphones, as that is what they will (mostly) ever know.Landline usage will go down, and wireless will increase. My kids have had cell phones for years, and I have the piece of mind knowing where they are just by picking up the phone. (Or watching the blip on the computer screen).