When I call someone I cant hear anything

When I dial a number I cannot hear the dial tone, or indeed the person who answers the phone, unless I switch to loud speaker. I have checked all my volume settings etc, anyone have any ideas how to resolve this? All updates are up to date etc etc. many thanks

PS I have tried:
switching on / off
Plugging headphones in / out several times
checking for fluff / debris in the headphone jack
I can still call someone using headphones or speaker phone, but not as 'normal', I will try a full restore....unless anyone has any better ideas

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