I really did not see a need for any "fancy" cellphone. I had a blackberry and switched to an iPhone. I like the iphone better. It is all about how you are going to use it. Some of the things you can do with the iphone (and most of them you can also do with the blackberry).
1. It syncs my contacts between my laptop, desktop and iPhone. Nice backup if you have one stolen, nice to have all contacts on all devices. It also syncs my calendar.
2. It automatically connects to an open wifi network. (asks first of course). With the wifi connection you are not using any minutes. I used it last week when my wife's flight was delayed by weather to check the airlines website and compared their info to the info on the big board. I also used it to check a price while inside a Best Buy, interesting when you show them the web price and compare to what they in the store.
3. Doubles as my iPod. I don't need a separate iPod, it also plugs into my F150.
4. Location/maps. Had to go to Sioux City to help a friend. Forgot a map. The built in GPS on my IPhone located where I was and the built in maps let me navigate. The weather feature is nice. I keep the weather for Barrow Alaska handy so I can feel better when it is -10 in Omaha and -40 in Barrow.
5. Built in scientific calculator. Replaced most of my TI for school/research purposes.
6. Download pics taken with the built in camera to my computer. My former razor required me to "send" my pictures to an email address and they charged by the picture. I don't use the text messaging very much but I can assure you that it is one of the preferred methods of communication with high school students.
7. Applications: Many of the third party applications developed for the iPhone are free. I use the "level" which turns your iPhone into a level. Nice and it is always with me. The Graphing Calculator replaces another part of what my TI would do. Unit converter is nice to convert between various temperature scales. It also does area and volume conversions which I tend to need from time to time. Urban Spoon uses the built in GPS to find/recommend restaurants near your current location. There are thousands of apps with stuff for the building trades, cooking, finance etc.
8. Books. I have a number of reference books on my iPhone. Nice to have available when needed. Movies, You can download/watch movies/podcasts and TV shows on the iPhone. Nice when sitting around airports with nothing to do. I download the free videos from iTunes U. Some interesting learning experiences.
9. Recreation: I have an app called Baseball which has the rosters for just about every major league team in history. Want to lineup for the Brooklyn Robins for 1920... it's there (yes I know totally useless for most people). Games iBowl is about as good as a Wii.