I've been known to do over 3000 texts in a month. I did lower my text plan when a frequent texting partner got a blackberry and we could do PIN messages, which are off the SMS network and free of any texting charges. I like texting because I can have a conversation where voice calls are inconvenient or impossible. I work in an open cube and I don't know that my boss would appreciate overhearing me talking dirty to my boyfriend.
My phone is my lifeline. I don't have a landline. If I'm without my phone for longer than 24 hours, I get twitchy. As for costs, the companies charge what they can get away with charging. I foresee more companies offering "everything" bundles that make more sense.
My daughter is 8, she just informed me that she doesn't want a new iPod for Christmas. She wants an iPhone.