I have a strange experience with my wife’s FP2. It had developed a fault with the bottom module (mic not working). I inserted a bottom module from anothe my old FP2 but that did not work as the replacement module also had a problem (power). So I put the original module back. Now my wife’s phone seems to have my data on it - not her own. It only responds to my passwords. I have not swapped SIMS.
Does anyone have an explanation?!