You asked if having a cell phone is a necessity. I don't think it is, but I voted 'yes' because it has become one over the years. You always miss it if you forget it or run out of battery. Plus it's very useful in an emergency (when you have signal, of course). I have one and carry it around everywhere I go because you never know when it's needed. As far as music, internet etc go, I use none of them. My phone is for talking, texting and, lately, a watch because mine needs a new battery =P
Hugzz!