What kinds of tech gadgets do you carry around?

What do you have and what do you use it for? I don’t mean the obvious (like “I use a cell phone to make phone calls”), I mean things like: communication, picture taking, listening to music, surfing the web, taking notes, building spreadsheets, storing lists, work, whatever. How often do you upgrade to a new gadget? How much do you spend each month to make the gadget useful to you?

I have a cell phone that’s about five years old and can only make calls. I use it to calculate gas mileage in addition to making calls. I don’t even message. I pay about $25 a month for 60 minutes of “free” airtime, and I don’t even use that up, most months.