My FP1 suffers from more or less severe connectivity problems (independent from SIM slot). It constantly loses network connection, resultung in lost calls, and calls can only be made in every 2-3 attempt. The problems started occuring after a period about 6 months ago when I had openened the phone for a camera replacement, but I also had a rain/water contamination by that time. So it may have to do with either of them.
Is there any way to diagnose what the problem could be? I suspect it is
a) either a connectivity problem with the antenna, which could be solved
b) an internal electronics problem, which would mean I’d get a new phone
c) other ideas?
PS: The problem occurs with different SIM card on different networks in various countries. WiFi works flawlessly.
Many thanks for this reply - this may be helpful for further narrowing down the problem.
So I cleaned the contacts and other surfaces I could find using alcohol. Including the antenna connectors (of the coaxial cable). The problem was actually gone for one or two days after the cleaning procedure, but now it is back. I assume that there was still some alcohol left, which may have improved the connectivity.
I am close to giving up the phone, this may be an internal electronics issue that cannot be repaired. I am going to write to support if they have further diagnostics advice.
I have just received a reply from support, however this wasn’t very useful. They recommended me using a new sim card and to send a photo of the sim card contacts. I have already cleaned these and tried different sim cards.