IPhone 4 call quality

So me and my partner upgraded our o2 contracts yesterday and got the iPhone 4.
We had iPhone 3GS' before that.
When talking to other people and hearing them through the ear piece, it was crystal clear. (With iPhone 3GS')
People used to comment on how good the sound of my voice was.
With the iPhone 4, when I hear my partner and he hears me, it is as if we are talking from far away or in a cave... It is no where near as clear as the iPhone 3GS.
When speaking to friends who are using a 3GS they sound clear but say we sound as if we are in a cave...
Is this the noice cancellation making our voices sound strange?
Any ideas?

Signal strength is one thing but signal quality is something else, and is much more important with digitally-encoded communications transmissions.
As an example, in the old analogue TV days (now phasing out in favour of digital in the UK), if there was interference on the signal, all you got was a somewhat snowy picture and fuzzy sound while the interference persisted, but picture and sound nonetheless. Now with digital TV you will get picture freezes and no sound if there is interference that degrades signal quality (not signal strength).
With that in mind, and also seeing that GSM uses different transmissions from 3G, it may not be your iPhone that has a problem but it is more than likely the network and the specific conditions where you are when trying to make calls - unless, of course, the problem happens everywhere across a wide range of different environments in which case it is probably the phone that is at fault.
Assuming that you've checked coverage maps for your network operator then the next stop is complain to the network. After that, get your phone checked and replaced if necessary.
We are in a marginal 3G coverage area on O2 so the experience that you describe is very familiar to us.

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