FP 3 / other caller hears me twice

Do you mean there is an echo?

If so this is a reported problem with WhatsApp, Telegram etc, but uncommon in normal calls

https://forum.fairphone.com/t/echo-cancellation-not-working-for-certain-apps/71295

see

https://forum.fairphone.com/search?q=echo

There are reports that this is known to Fairphone and a fix is in the pipeline.

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