PROBLEM SOLVED: Not a Fairphone problem.
After extensive searching I found the reason for the malfunctioning:
I have a contract with O2 which gives me three SIM cards on the same mobile phone number. Only one of them receives SMS messages from O2. Which one that is has to be set on the O2 support website.
Due to format reasons I had to change the SIM card when moving from my old phone to the Fairphone and I forgot to change the delivery settings accordingly.
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