Let the hive mind of Engadget get that for you.
"I am looking for a device that will stream sound from one source to several recipients. For example, I want to stream sound from my TV or stereo to my phone or MP3 player that has radio and Bluetooth capabilities. I have looked into radio transmitters and they seem like a decent choice, but I can't find one that uses external power (USB or from the plug) and I would want one with a transmit range of around 50 meters. Thanks!"
I'm sure you'd be thinking "damn.. I wish I had a cell phone right now" when your car breaks down miles from anywhere on a road with little or no traffic.
Not to mention, having to search for blocks before you find a payphone is a pain in the @ss.
I personally don't understand how anyone in todays society doesn't have one. Example.. I ran into an elderly couple the other day who were searching for an address near my office, which is in the middle of an industrial area (i.e. No Payphones). They aproached me and asked if they could make a call on my cell. I graciously let them. While dialing the old man looked at me and said "Never had one of these you know. I don't need one."
I laughed to myself as he continued his call.
I felt the same way as he did, until I got my first cell phone. I don't talk on it while driving or any of that crap. I use it for work every now and then, but it has been a life saver so far.