I'm a woman who never gets her nails done
I just don't get the phenomenon. I hate the smell of nail salons too. A friend of mine who makes $10/hour (with a Master's) and lives with her parents gets her nails done all the time, as do her co-workers. Her reason is that they have to wear uniforms in her field (health care) and nails are the only individuality they're allowed to show. Still, I can buy a bottle of nail polish and do it myself for a lot cheaper.
As for today's necessities. Many of them are necessary for finding a job (good luck applying without a valid email that you are expected to respond to quickly). The only people I know personally who do not have computers are senior citizens who have no desire to get one. If you don't have a computer (or the necessary skills), it will hurt you in the job market. In my field, you will not be hired if you do not have a laptop and you are expected to use your own computer for work (I just landed a position where they gave us computers and I was about to die of shock).
Cell phones have replaced landlines for younger people (I'm 33 and the last time I had a landline was when I lived with my parents). I don't see myself having one again in the near or distant future. When I was away at college (only 1 year) and had a shared landline with my roommates, I frequently spent $50+ a month on long distance calls. Now with cell phones, I never have to worry about a bill like that again on top of local calls. A call is a call period.