24ways.org makes this good point:

If you’re a U.S. resident, listen up: You must rid your vocabulary of the term “cell phone”. We’re one of the few economies on the planet to refer to a mobile phone accordingly. If you care to find yourself in any of the worthwhile mobile development circles, begin using terms more widely accepted: “mobile” or “mobile phone” or “handset” or “handy”. If you’re not sure which, go for “mobile”. Such as, “Yo dog, check out my new mobile.”

I live in a country where 102,5% of the population has a mobile phone. That doesn’t mean that all have, but that many people have more than one number (and a few still doesn’t have a mobile). In comparison, 82% of all homes have a landline, and 44% have a DSL (or faster) broadband connection. Even with 5 and 6-year olds, 6% of Norwegian kids have their own mobile. By the age of 8, the number is close to 40%, by 12 the number is over 90%.

Make sure your site look good on mobile browsers. I just installed a WordPress plugin for mobile browsers on brilliantdays.com. There’s also a similar plugin if you want to make your site look good when browsed on a Wii.