How much does your iPhone service cost you each month?

I’m curious about what people are willing to pay for service that connects them to the Internet, as well as provides phone and music, and other “apps.” I guess we might as well throw in Blackberry and Sidekick. I would like the full amount you pay each month to get everything you get.

If you want, you can say what you use the phone for, and why it is valuable enough to you to spend that much keeping it running.