Stam, you may not need an iPhone, if all you want is a basic phone/text messaging system. It's not much better than your phone at those things, and is maybe worse at just making phone calls (just see how many touches it takes you to call a 7 digit number, vs a regular phone)

The things I think are great about my (original, older model) iphone are:
* Tides & Currents apps for fishing the salt
* Acceptable though not nearly great camera, which can easily email photos (love sending pics to my kids when I'm travelling)
* Very good email client if you are in the USA travelling anywhere you can get/send email easily
* Some decent games can be had (play fieldrunners while flying)
* Podcasts of Robbo/The Outdoor Line (plus any other ipod stuff--music, video)
* Surprisingly useful google maps on your phone -- even fake-GPS's your location on the old phone by cellphone tower signal strength.

In all pretty darn useful--especially in the USA where the data plan is flat-rate, I almost never travel with a computer anymore, just my phone and wallet.
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The charm of fishing is that it is the pursuit of what is elusive but attainable, a perpetual series of occasions for hope. -John Buchan