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So, the bumper does NOT help? - This is very concerning. I thought the bumpers prevented the drop. Looks like the bumper is NOT a solution, after all.

What's more alarming is that you have to restrict your calling based upon poor service. How is this acceptable?

What is really strange is that other AT&T phones work fine, while the iPhone has a noticably lower signal strength when compared side by side.

The bumper most certainly "DOES HELP WITH THE SIGNAL FOR ME". It still drops, but no matter where I am now, I cant get the signal to drop all the way
 
I would encourage anyone having real issues sustaining phone calls to go into Network and switch 3G off. Half the problem with iPhone has always been that switch from 1 bar of 3G to 5 bars of Edge.
 
So, the bumper does NOT help? - This is very concerning. I thought the bumpers prevented the drop. Looks like the bumper is NOT a solution, after all.

What's more alarming is that you have to restrict your calling based upon poor service. How is this acceptable?

What is really strange is that other AT&T phones work fine, while the iPhone has a noticably lower signal strength when compared side by side.

What actually happens to almost any phone is that your hand is close enough to the antenna that the capacitive effect of your hand detunes the antenna to some degree which causes signal loss. This isn't the same thing as the iPhone antenna actually shorting across the non-conductive gap which totally ruins the signal immediately. The iPhone has BOTH problems. I bought a case from AT&T and it works great, I have no noticable signal loss at all with it as it prevents the short AND puts a little distance between my hand and the antenna. I'd be wary of buying a case (or any other accessories) from the company that just sold me the faulty phone, however. Apple's "bumper" will keep the hand from shorting the antenna but, knowing Apple, it's probably so thin and so tight that it will do practically nothiing to prevent excessive detuning from the capacitive effect of the hand.
 
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