https://community.sony.si/t5/xperia-archive/xperia-z-ultra-c6833-unable-to-make-receive-calls/m-p/3341839#M460563 <P>I have a similar problem. Changed to a different simcard and the phone works. The original simcard works on other phones.</P><P>The only differnce I can see with another Z phone also with Android version 4.4.4 is the option ..more &gt; mobile network &gt; network operator does not exist on my phone.</P><P>I have reset to factory and the resut is the same.</P><P>Appreciate any help.</P> Sun, 22 Mar 2015 09:39:33 GMT yusofsh 2015-03-22T09:39:33Z https://community.sony.si/t5/xperia-archive/xperia-z-ultra-c6833-unable-to-make-receive-calls/m-p/3341837#M460561 <P>I live in Tokyo and bought a new C6833 Xperia Z Ultra thru amazon.co.jp, around May 2014. It was working fine until Sep 2014, after which suddenly it will stop making / receiving calls. But the signal on the display looks normal and no error messages. If I try to make a call it would abruptly stop with a beep and when someone dials my no, they would get the message that my&nbsp;phone has been turned off. But the Wifi &amp; LTE data mode works fine.</P><P>Initially I thought it was a sim card reader issue &amp; would reinsert my sim card. For few minutes it seem to work fine and the same problem happens again. I also tried resetting my phone using phone companion, but same result. Then I tried resetting once &amp; didn't turn on the LTE data / wifi. I was&nbsp;able to use it "just as a phone only" without any issues for more than 2 weeks. When I turned on the Wifi / LTE data the problem happened again. So the issue doesn't lie with the sim card reader, but probably a software issue.</P><P>I also thought I may have accidentally bought a stolen phone and checked with my carrier (docomo) whether my Phone is IMEI restricted. There was no issue and my phone is not blocked.</P><P>Does anyone else have this same kind of issue?</P> Fri, 02 Jan 2015 04:00:05 GMT https://community.sony.si/t5/xperia-archive/xperia-z-ultra-c6833-unable-to-make-receive-calls/m-p/3341837#M460561 karthikmg 2015-01-02T04:00:05Z https://community.sony.si/t5/xperia-archive/xperia-z-ultra-c6833-unable-to-make-receive-calls/m-p/3341838#M460562 Why don't you try using a different sim card and see if the problem persists. Fri, 02 Jan 2015 04:09:51 GMT https://community.sony.si/t5/xperia-archive/xperia-z-ultra-c6833-unable-to-make-receive-calls/m-p/3341838#M460562 Phy 2015-01-02T04:09:51Z https://community.sony.si/t5/xperia-archive/xperia-z-ultra-c6833-unable-to-make-receive-calls/m-p/3341839#M460563 <P>I have a similar problem. Changed to a different simcard and the phone works. The original simcard works on other phones.</P><P>The only differnce I can see with another Z phone also with Android version 4.4.4 is the option ..more &gt; mobile network &gt; network operator does not exist on my phone.</P><P>I have reset to factory and the resut is the same.</P><P>Appreciate any help.</P> Sun, 22 Mar 2015 09:39:33 GMT https://community.sony.si/t5/xperia-archive/xperia-z-ultra-c6833-unable-to-make-receive-calls/m-p/3341839#M460563 yusofsh 2015-03-22T09:39:33Z