- You spend a lot of time away from a power point.
- You make more than 3 phone calls a day.
- You live in Australia and are with Optus (their 3G network is patchy and slow).
- You rely on your mobile for your livelihood.
For me personally, having an iPhone is win for the following reasons:
- I can check my email from anywhere (not that I need to, but it's cool anyway), even in the middle of Northern NSW. ;>
- I can chat on IM as long as I'm not busy at work or asleep. :p
- I can Google anywhere.
- It's no longer painful to conduct a conversation over SMS.
- I carry my music library everywhere I go (and I don't need to cart around a separate iPod!).
- I has a Shiny (lame, but I am a shiny obsessed geek).