Iphone 5s bad réception 3g and 4g signal and call

Hi, my iphone 5s very bad network reception in my home and my calls is very bad quality same outdoor.
Ios 7.0.2.
Sim card ok
All settings by defaut.

Hello there Kevkev5s,
It sounds like your call quality and reception are low both inside, and outside. I want to recommend a couple of articles to help troubleshoot the cellular connection quality. The first is named:
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 after restoring the iPhone software, contact Apple Support.
If the issue is not resolved, or the above does not help I would next try the troubleshooting in this article named:
iPhone: Troubleshooting issues making or receiving calls
http://support.apple.com/kb/TS3406
Thank you for using Apple Support Communities.
All the best,
Sterling

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