FP4: Caller ID "unknown" after last update of /e/OS (2.7-u) on Fairphone 4

Since the last /e/OS update the caller ID always is “unknown” after a few calls.
Whenever I restart the phone, the first call appears with a number. However subsequent calls appear as “unknown”. No telephone number is shown of the caller.

Is anybody else experiencing this problem?

/e/OS Version: 2.7.u-20250109460370-official-FP4
Provider: Spusu (Austria)

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YES!!! I thought I was going crazy (and the phone service provider shares this view).

However for me it started 3 weeks after the upgrade of my FP4 to 2.7-u. Also, at first I could see the first number after reboot, but now reboot doesn’t help anymore.

To clarify: I don’t even see the number which is calling me, not just that I don’t see the associated name. All it says on the screen (and later in the call log) is “Unknown”.

I would very much appreciate any pointers, this makes the phone worse than useless. If I miss the call nobody knows they won’t receive the return call, because I don’t know who called me.

I might have found a workaround - it is too early to tell if it helps in the long run, but for now it works (I see the Caller IDs).

What helped is that I have disabled option “4G Calling - Use 4G services to improve voice calls (recommended)”. I can also reproduce the problem by enabling this option again, and fix it by disabling it.

I’m still curious why this happened though and why this option affects caller IDs.

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Disabling the option “4G Calling - Use 4G services to improve voice calls (recommended)” also helped for me.

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It might have something todo with the change mentioned in the release notes of v2.7-u → Bug Fixes
It says: Fairphone 4: eSim supported again