… und ich dachte, ich mach was falsch. Übungshalber probier ichs jedesmal 4, 5 mal mit dem Fingerprint, mit den o.g. Rückmeldungen. Die Erkennungsrate liegt bei ca. 20 - 25 %, wenns eilt tipp ich eh gleich meinen Code.
Lieber überback, kannst du berichten, ob der Support weiterhelfen kann?
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Auch ich habe massive Probleme mit dem Sensor. Ich nehme die Fingerabdrücke auf und am Anfang klappt es gut, jedoch lässt es dann nach bis hin zu sehr sensibel, was die korrekte Position zur Erkennung angeht. Außerdem reagiert der Sensor auch auf “nicht Finger”. Für mich leider enttäuschend.
I also have massive problems with the sensor. I take the fingerprints and in the beginning it works fine, but then it gets less sensitive up to very sensitive regarding the correct position for recognition. The sensor also reacts to “not finger”. Unfortunately disappointing for me.
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Did you get answer from the support?
Ensure your fingers don’t contain grease yet are dry (ie. wash hands or after shower). Try with a different finger, or ask a friend to try it (while you’re with them). Some people do labor which destroys or destroyed their fingerprints, and certain foods or weather conditions can make it tougher as well. Given you said it works on another phone that isn’t it. Also, as already mentioned, use different angles.
f that doesn’t solve it, perhaps your sensor is faulty. I’d contact support if I were you. Tell them everything you already tried.
As for the position it depends on the hand and how you hold it. In a case (I use Anna Treurniet’s), its easier to feel (more difficult to miss).
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glad to hear I’m not the only one.
by now i added 5 fingers: all are my right index. Every time I add a record it works fine for a day, then the recognition rate deteriorates. This morning I wanted to try again and now I can’t even add a new fingerprint because the sensor is supposedly dirty, which is not the case.
So this is starting to look like faulty HW after all.
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I have the same issue with my sensor. In some situations it doesn’t work even if I switch fingers after the first attempt. I also have an assumption that is has something to do with the temperature.
My fingerprint sensor is a bit hard as well. My mother-in-law also has a Fairphone 3 and she has the same problems.
A few tips that makes things better:
-I found that pressing the sensor for a longer time works better. I had the habit from my previous phone to put my finger on the sensor and immediately taking it away. This sensor need to be pressed for 1 or 2 solid seconds to work better.
-You need clean and dry hands. The slightest layer of grease makes the sensor unusable.
-I clean the sensor once a week with the same piece of cloth I use to clean my glasses
-The less fingers you registered, to quicker the detection is. Try only registering 2 or 3 fingers.
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Got my FF3 3 months now, the fingerprint sensor has been malfunctioning since the start. No update nor any other actions (cleaning, rescanning etc.) did help.
The Support send me a mail, suggesting trying to WASH MY HANDS 
Along with some clicked together text snippets how to delete, rescan the prints, try safemode or factory reset. None of that helps actually.
All much cheaper phones I used before did work just fine. Why, actually even with greasy hands while working on a car. The FF3 doen’t recognize my prints even under cleanest and best conditions. Sometimes it unlocks on 2nd try - but that is rare. Most times it locks me out saying the sensor is dirty.
Ah, and support suggests to try to use the phone not in hot or cold conditions. Well, all previous phones an tablets did not care and unlocked just fine, no matter if cold or hot. My FF3 doesn’t at room temperature.
At this state the fingerprint sensor is unusable in real life conditions. Am rather disappointed!
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I wanted to contribute to the conversation. I have had my FP3 since November and likewise experienced issues with my fingerprint sensor, which did not work in many real-life circumstances. However, at the time I did not see it as a big issue as I did not particularly depend on it.
After reading some replies on this forum I decided to take the advice into consideration. I removed all fingers recognized and added only two fingers, one for each index finger. In this process, I noticed that the software was more selective when configuring my finger than when I had set it up. It is possible that a software update has changed configuration to be more accurate since I set up my phone last November. For this reason I encourage others to see if this fixes their issue.
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I also had problems with the fingerprint sensor recognizing my finger for months, so what I did some weeks ago, as I readed in this forum, was removing my old recogniced fingers and adding new ones, trying to be precise when adding them and adding less fingers (for a quicker recognizion). It seems to me that the fingerprint sensor is now more reliable and it works better most of the times.
Hope it helps you too!
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Fingerprint sensor works fine for me. Nethertheless the detection rate is much better with recently learned fingerprints - if you’re working a lot with your hands it seems to be a good idea to remove and add the fingerprints about once a month. This really saves time everytime you’re unlocking the phone.
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I have problems too and use the sensor in different apps.
I put on strip tesa on the sensor. Now it works great (recognition rate 95%)
Unconventional but cheap 
Maybe the sensor is too sensitive.
Have a try. Maybe it works on your phone too.
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Adhesive tape (Tesafilm TRANSPARANT) on the sensor still works after 2 weeks.
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I put on strip tesa on the sensor. Now it works great
Thank you for the advice 
I gave it a try for 6 weeks - with tesa/ahesive film, the fingerprint works reliably in all conditions, i.e. usually 1st try is a success, while after removing the film, around 50% of login tries fail completely, i.e. using several fingers several times until fingerprint is de-activated due to too many failed tries. Moreover, with film, I virtually never saw the message “sensor dirty” while in fact, it was clean - without film, this happened many times a day.
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For me too the fingerprint scanner works way better with adhesive tape on it. Which is very nice and and I’m glad about it.
(Well, as long I don’t think too much about the fact that a little piece of adhesive tape, that probably costs less than one cent improves the user experience of a device that I paid 450 Euro for by that much, that is.)
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For me, a tesa strip mitigates the issue a bit and it’s certainly better than without, but we’re talking unusable compared to barely usesable. Detection rate is still very low for me (I’d guess ~20% on average), even requiring a manual pin unlock about ever three unlock tries since the sensor gets disabled… the more humid it is is, the worse it gets, same if it’s too dry. Not to mention that the sensor is often triggered when the phone is in the pocket and gets disabled again. It’s even a step back compared to my previous phone which had a smaller sensor on the power button on the side, which wasn’t great either but still worked for 3 out of 4 scans. It’s really disappointing, that a manufacturer so keen to be sustainable uses a component so bad that you are basically forced to get a different phone when you are relying on this functionality. I hope there will be an upgrade for this sensor soon.
This was the single most helpful advice about the FF3 fingerprint sensor.
It takes time!
While my previous phones required only a light touch with the finger, even just scarping it, the Fairphone sensor works best if I press my finger firmly, for the better part of a second, always at the same angle, into the middle of the sensor.
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Just came here to say that I’m baffled but indeed putting a simple piece of transparent tape over the sensor makes a tremendous difference. Before the tape the sensor only ever worked for me in optimal conditions, which was almost never. I don’t know if I have an atypical amount of moisture on my fingers or something, but just the act of typing on my warm laptop makes my fingers “greasy” enough for the sensor to register as dirty. Same if I washed my hands in the last few minutes, unless I manage to get them extremely dry. Same if it’s cold outside - this has nothing to do with my hands, but if the sensor gets cold there tends to be a bit of condensation on it, which, too, renders it useless. Curiously I sometimes use my phone in the gym with quite a bit of chalk on my fingers, but as long as my hands are dry it’ll work.
I feel like the sensor is just super sensitive to any kind of moisture. How exactly the tape mitigates this is unclear to me, but since applying it I haven’t needed to type my password because the sensor got disabled for too many attempts. There’s still the occasional miss, but it now works in situations where previously I wouldn’t even bother trying and went for the password directly.
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Thank you for this tip! I’ve put tape few weeks ago and it works perfectly so far. After putting the tape I’ve cut it with craft knife to fit perfectly, so it’s not visible.
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Bravo, I put some tape on mine, it’s dramatically better, I haven’t had the ‘fingerprint sensor is dirty’ message since