I have the iPhone 3G, but my daughter and son in law both have the 4.
I asked them yesterday if they have had any problems, and they said “no”!
They love theirs, and I am looking forward to getting one soon. I think the whole thing is a teapot tempest.
We are in a relatively rural area, by the way, and they travel a lot, using their phones all over the place.
The problem has been well documented. It depends on where you are and how many towers you have in your area.
Its a real problem. If it wasn’t I kinda doubt Jobs would have gone public.
By painting the other phones with the same brush he has caused damage to their companies. I hope he can back his claim up.