All my smartphones lasted 4+ years, except ironically the FP3 that only lasted 2 years. I really wanted to like it, but assembly quality was terrible, battery was falling on the floor all the time, and max volume for calls was almost unaudible, an apparently rare problem they have been unable to solve.
I hope they have improved since and wish them the best, but as sick of Apple I am, I am also too afraid to try FP again...