https://community.o2.co.uk/t5/Android/S21-Ultra-Calls-mostly-silent-and-fail-after-10-seconds/m-p/1484846#M78151 <P>I have had this phone 5 months and had nothing but issues with it.&nbsp;</P><P>I've ruled out SIM issues, apn problems, network issues. I've disabled WiFi calling, 4g calling and 5g and the issue is still there.</P><P>&nbsp;</P><P>Phone calls are silent both ways with the cause being this device. I have factory reset it and still the exact same. O2 give basic advice saying the network may be busier than usual.</P><P>&nbsp;</P><P>&nbsp;</P> Fri, 03 Sep 2021 15:36:50 GMT Pan82 2021-09-03T15:36:50Z https://community.o2.co.uk/t5/Android/S21-Ultra-Calls-mostly-silent-and-fail-after-10-seconds/m-p/1484846#M78151 <P>I have had this phone 5 months and had nothing but issues with it.&nbsp;</P><P>I've ruled out SIM issues, apn problems, network issues. I've disabled WiFi calling, 4g calling and 5g and the issue is still there.</P><P>&nbsp;</P><P>Phone calls are silent both ways with the cause being this device. I have factory reset it and still the exact same. O2 give basic advice saying the network may be busier than usual.</P><P>&nbsp;</P><P>&nbsp;</P> Fri, 03 Sep 2021 15:36:50 GMT https://community.o2.co.uk/t5/Android/S21-Ultra-Calls-mostly-silent-and-fail-after-10-seconds/m-p/1484846#M78151 Pan82 2021-09-03T15:36:50Z https://community.o2.co.uk/t5/Android/S21-Ultra-Calls-mostly-silent-and-fail-after-10-seconds/m-p/1484931#M78152 <P><a href="https://community.o2.co.uk/t5/user/viewprofilepage/user-id/4572763">@Pan82</a>&nbsp;</P><P>You can send it into O2 to be repaired but personally, I'd contact Samsung to do it.</P><P><A href="https://www.samsung.com/uk/support/contact/" target="_blank">https://www.samsung.com/uk/support/contact/</A></P> Fri, 03 Sep 2021 22:40:45 GMT https://community.o2.co.uk/t5/Android/S21-Ultra-Calls-mostly-silent-and-fail-after-10-seconds/m-p/1484931#M78152 MI5 2021-09-03T22:40:45Z