Just to share an experience on fairphone 3, that had with time weaker and weaker reception. Ended up obliged to leave phone outside even in major cities, remembered me early mobile phone network…
I found out the pattern of the antenna at the back (upper right) was damaged and cut in several places. I managed to fixed it using a conductive paint, not sure how long time it will last but I am now back with normal reception.
Purist will argue i did not probably did not matched excalty the impedance of the antenn with approximative pattern, however it works quite well.
Hope this can help anyone with similar situation.
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Welcome to the community forum.
Do you have another phone or camera to post a picture of how it looks now?
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Original antenna can easily be found on the net, here is my quick fix.
Could be better, and i ll probably apply varnish at some point, as i suspect friction from cover and antenna caused the damaged.
The electric resistance is not perfect, on a test surface i did separatly, probably around 10 ohm on the longest lenght even though i applied several layers, but better than nothing anyway, i did not found a good back part for replacement. Will keep you updated on how it last with time.
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Interesting, thanks 
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Hi @El_Grinch !
Can you provide updates about you fix ?
Do you have a more stable connection to mobile network since you applied the conductive paint ?
I’m facing unstably and “week signal” issue since a month on my FP3. I tried everything on config, I changed my SIM card and so but without improvement on signal…
I guess that your fix is my last chance but on my side I cannot see damaged and cut on the angular stripes…
Thanks
Martin
@Cocap10 Not excellent, but it definitely (well for the moment) solved my problem making my phone usable again. Now if your antenna pattern are not damaged, I do not think it will change anything messing around with them, could even potentially worsen reception as these pattern carry high frequency very sensitive to lenght, widht etc…Modifying them affect reception and emission, don’t touch if not damaged would be my advise…
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Okay. Thanks for your feedback.
I guess my last option is to send my FP3 to the support center 
Hello. Thank you for this. I have the same problem. Could you give a 6 month update and any suggestion on what conductive paint to buy and any other instructions.
My alternative is to buy a second hand Fairphone 3 and combine the modules to get a working Fairphone 3+
Thank you
Hi there. It lasted up to very recently, but i saw it was somehow disintegrating away. I guess same cause same consequence, looks like it is a zone hit when the phone is falling (not particularly careful with my phone). I finally found a second hand rear module for a fair price, so I changed it last month, and that is what I would recommend, what I did was a quick fix thought it lasted much more than I thought.
The paint I used was called liquiwire, there may be better product, but then, price will be equivalent to a good second hand module.
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I am interested to understand this better. I just came from a phone repair shop. My phone had fallen and the volume up button was jammed stuck. The engineer fixed it for me, but he also said something about the antenna in a manner I did not understand (thick accent and rambling way of talking).
I had no idea the wifi receiver antenna would be a pattern, or what shape it can or should be. But I would like to have a look at it myself, after having seen your image. What part of the phone should I look at to find this antenna pattern?
Ps. My wifi reception has also become way worse since that fall, hence my search for enlightenment.