Need help Phone signal going on and off

I need help with my Z3, I just installed the new update (23.0.1.A.5.77) and the phone signal won't connect. It keeps fluctuating off and on. It was working perfectly fine before the update. I even did a reset but its still the same.

Hi Flexatron,
Welcome to the community! Since you're new please be sure that you have checked out our Discussion guidelines.
Did you by chance try simply removing the SIM card from the handset for around 30 seconds and putting it back in and restarting.
This could be a simple communications issue with the SIM.
let us know how you get on.
 - Official Sony Xperia Support Staff
If you're new to our forums make sure that you have read our Discussion guidelines.
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