If you mean a true "Iphone" then I can't help you.
I'm using an original Droid and I have posted from it although I use it mostly just to observe when I'm away from my desk. I think Shaggy uses a Droid to post quite often.
I had a blackberry smart phone and went back to my original phone . . . what a waste of money! I am even thinking of taking the text feature off my phone. Heck, if anyone wants to talk to me, call me or keep quiet!!
I had a World Edition Blackberry eriemermaid and going from a conventional cell phone with just email and a phone to that was a "long learning curve" for me. They hated to see me coming at the Verizon store.
It didn't have a camera but neither had any of my prior cell phones since I almost always have a camera or two with me anyway. I will say that it handled my Charter email accounts way better than my Droid does although my Droid works perfect with Gmail. I did like the quality of the BlackBerry better than most phones.
Our son bought a Droid Bionic last Thursday (the day they were available) to replace his original Droid and he says it's a major step forward. Even has an 8 megapixel camera. The big thing with the bionic is it's a 4G phone and we don't have much 4G service around here YET! He lives and works in Toledo and they do have it. He is checking to see how far into south county he can get 4G service. If we will be getting 4G anytime in the next couple of years that will probably be my next phone.
The Droid was a great phone when it came out but of course technology is moving so fast that it's hard to keep up. It had some memory issues but once I learned to tweak it that wasn't a problem.
I use mine for work so it's tax deductible so I can justify the price (at least to the IRS)