HURRAH, after only 3 days of owning the iPhone, I've actually made a call!! Albeit to O2 customer services to transfer my number from Orange, but still a call has been made.
It's pretty phone like, the ear speaker's not too tinny, I had a slight moment of panic when the O2 automation asked me to press a number, only to find when I took the phone from my ear, nothing was there!
It's ok though, I'd forgotton about the fact that the screen turns off when it's next to your face, and it quickly came back, I then figured out to tap the "keypad" button and I was away!
Debbie at O2 was very friendly and helpful, number will be transferred on the 16th and we had a quick chat about typing on the iPhone and how it takes a fair bit of adjustment.
The main thing so far (apart from tapping the wrong letters), is the preditction. All the "AMAZING MATHS" that goes into predicting what you're typing and it corrects correct words.
Example: I was typing "ported" into a tweet. iPhone was suggesting "porter", i typed ported, pressed space to go onto the next word and iPhone changed "ported" to "porter", I then had to go back and change it back again.
No while this is not the end of the world, it does slow down the typing process somewhat. The fact that pressing space accepts the suggestion and tapping the suggested word declines it, could be a bit backward. It's not suggesting every word like T9 or something, only odd ones, so it would seem better to tap the word to accept?? Have to see how that one goes.