IPhone 4 call failed when in a call

I've been having consistent but intermitted call failers which usually happen within seconds of connecting to a call or at around 20 min. Apple replaced my phone and AT&T replaced my SIM but it continues. My old 3G continues to work fine with no issues. Does anyone know what else could cuase this issue on just this model. I do use the bumper and it still fails calls when using a handsfree device.

Hey everyone there in mobile land!!!!
I had this problem very same problem with my iphone 32G 2g for close to 2 weeks and it was HIGHLY HIIGHLY frustrating.
Approx 10 seconds into any received or made calls it would cut out with "CALL FAILED"
Missed alot of important calls.
Simply put....it is not the phone, so don't go out and buy a new one like I NEARLY did.....It's your carrier...
I was informed by many ppl at my carrier Optus that if you have your same sim card for a lengthy bit of time (had mine for approx 6 yrs) it will eventually play up and do this.
If you are in australia it is a simple fix my peeps (I'm sure this will apply in USA, etc too) ....go to any outlet you can buy credit from (servo's, safeway,coles) and they all sell what's called $2 sims....buy one of them and then ring your service provider back, if your not on hold all day...and tell them your current sim card is not working. They will ask you for your details, and to read them the USIM number on the new sim card -  and they do the rest....they tranfer your same number, all your credit, etc..to the new sim card.
Give it 15-20 minutes then reset your phone... PHWOLLARRR !
Words!!
Lemme know how you all go
Glad I could shed a little light on it.

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