Sorry for the late reply. I think they promised "5+ years" of support for the FP3, so that could theoretically already end in August this year. However, like with the FP2, they have a great track record for long support and only ever seem to want to push that support even farther. Also I'm using the EOS ROM on this phone which is based on LineageOS. The combination of a very open phone and an open source OS leads me to expect I'll still be using this phone for another 5 years easily.