@james48
Try recording a voice memo.
If you can do that, the problem is with the other party, if not, your mic is broken.
https://www.apple.com/uk/retail/geniusbar/
I have no affiliation whatsoever with O2 or any subsidiary companies. Comments posted are entirely of my own opinion.
This is not Customer Service so we are unable to help with account specific issues.Currently using:
Pixel 7a (O2 & Lyca), One Plus 6 (Sfr), iPhone 12 Pro Max (Vodafone)