Currently is a trend of getting PDA Phone. There are many players in the market, HTC, Asus, HP, and recently Samsung as well. I am not sure iPhone is consider as PDA phone..

I got my-self a Asus P750, a 3G phone built in with all features, bluetooth, wifi, GPS, camera, video call, etc... anything, you name it, you got it... err... except TV broadcast. So far, I do not have any of issue with my Asus P750 and recently upgrade to the latest Windows Mobile 6.1 firmware. The more I use it, the more I love it.

You got to do a thorough research before you invest your hard-earn money into it. The most important point is, "do you need it" or "you just want to own it". What people hate most when using a phone?.. yup...
That is what you get from a PDA phone.."HANG". No matter what brand you get, more or less has the same problem. You have to be IT literate inorder to use a PDA phone. So... if you really need to get a PDA phone, get advise from experience user before you get one.