IPhone 5s poor call quality - static

I received my 5s a couple weeks ago and the phone had A LOT of static on the line during phone calls. I went to the local AT&T store and was told that it might be the sim card that was shipped in the phone, so they replaced it. That did not fix the problem. So, I ordered a second 5s and have had it a few days and am noticing the same level of static on phone calls. It's loud enough to be bothersome. Surely I haven't received the only two phones that have this problem?! I'm wondering if anyone has any suggestions for this problem, or if they've experienced this issue and if so, how it was resolved.
Thanks!

Hey guys
I got the same problem! But sadly no solution yet... ( i really hope this is a software problem....)
https://discussions.apple.com/message/23744858#23744858
During a voice call all my friends are complaining that they can't understand me.
After googeling i found out, that there were similar problems with the old iphone 5 (http://www.iphone5callquality.com/) but there are not that many people with this problem with the iphone 5s or 5c (I got a iphone 5c).
What to do...

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I placed the <ul> css code you supplied in the main.css file as well. No avail.
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Hello Elbeyrouni,
If I understand correctly, the call volume used to be fine but now it's hard to hear the other person.
Here are some steps to try for that.
iPhone: Receiver and call audio quality issues
http://support.apple.com/kb/ts5196
Increase the volume during the call.
Make sure nothing is blocking the receiver. If you're using a protective case or display film, remove it and try again.
Make sure nothing is plugged into the headphone jack or the dock connector.
Check the receiver opening to see if it is clogged with debris. If necessary, clean it with a clean, small, dry, soft-bristled brush.
Try another location with better signal. If the audio issue happens only when on a call, it could be due to the location.
If the iPhone is paired with a Bluetooth headset or a car kit, try turning off Bluetooth on your device. Learn more about troubleshooting Bluetooth connections.
Restart the iPhone.
Make sure your device is up to date.
If the issue is not resolved, contact Apple Support.
Thank you for visiting Apple Support Communities.
Nubz

IPhone 5S Bluetooth call quality

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Dabbaranks wrote:
I have the distortion/crackling/popping with non-music, non-voice sounds (game sounds) on my Sony SBH80. Is it a Mac thing?
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Hi BrunoSal,
Are you still having this issue? We'd love to have a look at it for you if it's still occuring, just let us know
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I've been having this huge problem with the iPhone5. The evidence i've collected seems to indicate this is a problem with all iPhone5's.
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http://forums.macrumors.com/showthread.php?t=1456404
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I've got an update on this problem with fading volume. I've isolated it to the set volume on the phone for voice calls when using headphones. When the headphone volume is set between 1 and 6 (out of 16 squares) the callers volume will consistently fade in and out. The fading which is normal to zero volume at 2-5 Hz is serious enough that normal conversation is impossible. When the volume is raised above 6/16 then the callers voice stabilize and I can hear all their words again. Unfortunately, at 6/16 volume their voices are too loud for the headphones.
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jab1820,
Thank you so much for reaching back out to us. Could you please provide us with your mailing zip code? With your iPhone 5s can you please reset your network settings. You can do this by going into Settings, General, Reset, Reset Network Settings. Then re-try the call quality after that reset has been completed. Please keep us posted.
KevinR_VZW
Follow us on Twitter @VZWSupport

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PROBLEM IDENTIFIED (..maybe)
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I just bought my iPhone 5. I was disappointed when I received a call and discovered the phone call quality on my end is bad. The other person's voice sounded very tiny and soft although I have already turned up the volume to maximum. Is it that way with all iPhone 5? The receiver could hear me clearly. I tried speaker and the person voice sounded much much clearer.
Please recommend suggestion to fix this or I have a defected phone?
Thank you!

Actually, after examining my phone properly, i think that this problem might have been caused by the plastic cover that I have yet to remove as it looks like it is blocking the earpiece. ><
My apologies.

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IPhone 5s poor call quality - static

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