This bug was related to the Checkup app, but not to the Fairphone OS 17.04.8 itself.
To me it looks like this LineageOS build is reading the MAC address from the wrong location. Might be related to the use of the Prima WLAN driver.
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I did not know that, thanks for clarifying! 
Today I had to use tethering and it didnt work. Tried both WPA and no password. When enabling tethering it just says “Error”. I can see WIFI network but cant connect to it.
Also: The preference double tap to wake shows in the settings but doens’t work. I wonder this is even possible with the hardware?
Dual sim works for me out of the box with the image @chrmhoffmann provided (coming from the latest open OS).
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I installed it today and I’m really imressed how well everything works!
Dual-SIM didn’t work for me until I swapped the SIM-Cards (Slot1 uses LTE now). 
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Doubletap to unlock is always Hardware-dependent. FP2 Display-Firmware doesn’t support this, as i heard.
I have to correct myself. Dual-SIM doesn’t work stable. It worked a short time, and maybe after activating and deactivating the Flight Mode, there was no signal at both SIMs. Now I swapped them again and it works, but I don’t know how long
Which modem file are you on? 4436.1-FP2-0-01?
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Hello everyone!
It is amazing to see that we have a working Lineage android N and I’d love to install it!
I have a question though… Is the hotspot working? I use it on a daily basis and is something I need to have, do you guys can confirm that still do not work?
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I’m on the modem files from 17.04.8 (About Phone shows 4436.1-FP2-0-00). Are they compatible or should I use other ones?
There are new ones (4436.1-FP2-0-01) included in 17.05.2, they should fix an issue with Fairphone OS and the proximity sensor. Maybe they fix other issues, too.
I do not know if it is relevant, but some German news portals recently have reported a major issue with the Samsung Galaxy S6 and S7 losing their mobile network signal in standby mode repeatedly after they were updated to “Nougat”, so it could be a general issue with “Nougat”…
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I can confirm that Tethering (WiFi, USB) is not working yet.
I think this bug is only related to Samsung phones and/or Exynos chipsets, probably Samsung updated the modem firmware for their Exynos chipset with their Android 7 update, which introduced those bugs. Or there is just a general bug in the Android Nougat implementation Samsung uses. So in short, I don’t think that the Fairphone 2 is affected by this.
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What do you mean “re-unlock the SIM-cards”? How do you do this?
I re-flashed the full zip and SIM-cards worked again (I guess until I would go into flight-mode again, which I won’t)
I hope Fairphone 2 does not need a modem firmware update for “Nougat”, too…
Were you asked to re-enter your PINs or have you stored them permanently? Maybe the problem lies with querying/forwarding of PINs to the modem firmware…
I thought the problem is there and removed PINs for both SIMs - didn’t change anything.
So you were asked for your PINs, re-entered them, and the phone did not connect? Strange…
Does that happen after wakeup from standby?
I was asked for the PINs and it didn’t seem to work. So I removed the PINs of both cards with an other device, but both SIM icons still showed “no signal”.
I don’t think this has anything to do with standby. As someone said above, I also don’t think that this Samsung-Story has anything to do with this problem.
It’s about reconnecting after leaving the flight mode.
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