Hi and welcome to the forum.
You may find a shop that can carry out a repair, it could be a loose mic. See
As fairphone angel (in Berlin) I have a lot of support cases with nonfunctional microphones in the bottom modul. A lot of users have minimum the 2nd, often the 3rd bottom module. Mostly easily changed by Fairphone support in warranty.
But there is a lot of waste (I collect old faulty modules and send them back for recycling).
So my questions:
Did anyone successfully repaired the microphone inside the bottom module by soldering a new smd microphone?
What’s the reason for the highly rate of f…
I have an FP3 with a 3.5mm jack for headphones, my daughter has an FP4 with a bluetooth and neither of use have problems.
The network/carrier bands are important a lot of places are closing down 3G, so if you were using that take care.
You can see the bands that the phones can use via the specs so ensure you have an equivalent where you are. Expand the Network section
https://shop.fairphone.com/en/buy-fairphone-4
There is also the method of purchase. There are companies that sell abroad, but unless they pick up the warranty on your behalf you don’t get any, let alone the 5 years for the FP4
The following is a list of resellers selling the FP4 by country + prices. It is a https://shop.fairphone.com/en/where-to-buy