Since the latest android update all of my incoming calls from contacts are ‘unknown’. Any ideas?
Welcome to the Community Forum.
This has occured in the past a few times, I think it’s usually an issue of adapting Fairphone OS to specific provider/carrier/network needs. I strongly recommend you contact Fairphone Support at https://support.fairphone.com/hc/en-us/requests/new and let them know about it (their form there will probably ask you to specify your provider anyway). In this forum we are (almost) all users “only”. 
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Come on Samsung, get on top of this issue.
Come on Huawei, get on top of this issue.
Come on Xiaomi, get on top of this issue.
Come on Sony, get on top of this issue.
And yes (please try to ignore many hits which are pretty old and concentrate on the newer ones) … Come on Apple, get on top of this issue.
(Feel free to add more vendors.)
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Support may well send you this link and say that unless you’re on one of the few supported providers, you’ll have to disable voice over LTE and voice over WiFi to make caller ID work again:
VoLTE and VoWiFi compatibility
There is only one supported network in the UK (for FP3) and a I’m not on it!
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Disabling LTE and voice over WiFi doesn’t work. In settings I used ‘Clear Mobile, data and bluetooth history’ and it fixed
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Interesting. I searched for “Clear” and"History" in settings and didn’t find that option
Hi
settings-system-reset options-reset wifi,mobile & bluetooth
beware you will need to reconnect all your wifi passwords and bluetooth devices. It worked for me, will be interested to know if it helps