You can do nothing with an iphone if you don't jailbreak it.
When i bought an iphone for my father ('sorry dad!') i wasn't able to find where to put my sim card. I Have to go home to find a little thing to take out the sim card. come on.... I have 3 sim card for different country. It will surely be the same story with the iphone 4.
Next, i wasn't able to send folders containing pictures of my father's little daughter on the iphone. IT'S A SHAME.


Who says N900 is buggy? Mine is excellent! it works really good since PR1.2! And before it was a little bit slow (because i had too much useless applications).
fMMS = MMS and works perfectly well.
N900 is not a "phone"? I can make a call easily, fastly. FASTER than someone who use an iphone.