ZTE Open C reboots during calls

The phone reboots during calls. OS version 1.3, latest according to ZTE.
Thing is, only when it is set to use 3G. But if I set to 2G the audio is absolutely terrible.
Both when using 2G and 3G sometimes the calls get cut-off on the receiver phone. I can hear the other person talking but the other person doesn't hear anything. This is another issue.
What can I do? The phone was bought from Ebay on September 2014.
Problem didn't start now, ZTE Ebay support said the issue was a SIM one. I recently changed to 3G because the noises in 2G are almost unbearable.

''Ralph Daub [[#answer-713346|said]]''
<blockquote>
Hi Falconet,
I understand you are experiencing rebooting and call quality issues on your ZTE Open C device.
Since ZTE is responsible for the Firefox OS build specific to your device, I would suggest following their advice.
You may be able to request a new SIM card for your device by contacting your carrier support.
I hope this resolves your issue. Please let us know if you have any other questions about your Firefox OS device.
Thanks,
- Ralph
</blockquote>
Hi,
What ZTE meant was changing carriers not just sim card. I can't do that for another 1.5 years. The reason they said is because the phone seemed fine for a while when using another carrier. Sadly, the SIM is fine since another SIM card from the same carrier does the same. Both are working fine on Android Phones.

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