I'm disappointed, but it's not Backmarket's fault. Living in a white zone, I absolutely need my phone to have FM. This was the case with some old Samsung models, even if it wasn't mentioned in the documentation. I read somewhere on the Internet that the M23 had FM, but in fact it didn't. Fortunately, my old A50 has started working again, so I'm going to keep using it. I'm keeping the M23 as a backup.