Cordless Landline Cell Phone Phantasy

A good friend of mine moved...but her number stayed the same! Ah, the miracles of cell phones - one number, one person. Except..she called me the other day to tell me her new landline number. That way she doesn't have to worry about the cell phone battery dying, see? But now which number do I call? We're back to two-plus numbers for one person. *sigh*.

What about me? I don't have a cell phone because I can't afford both landline and cell phone, and I don't want to give up the landline voice quality. Besides, why create two-number hell for my friends and family?

Both stories point to the need for a hybrid beast - a landline-cellphone. While in the house, my cellphone acts like a cordless phone, talking to the landline base station and giving me great reception. None of this wondering-if-my-cellular-service-will-get-reception-at-home nonsense. The base station has a cradle for charging my cell phone. And when I walk out the door, I grab it from the base station, and it becomes a cell phone. People call the same number, and they either get me at home, if that's where I am, or they get me on the cell, if I'm not. Or you get my voicemail box - just one box, not two. Not two that I have to remember to check, or that you have to call another number to leave a message at. Isn't that the point of cell phones? You dial me, there I am. One number, one person.

Not to mention that all of my phone contacts are in one place, so I always have the number for dialing you back.

Tell me if you see this in existence out there...