I have 4 and 8 year old phones (besides my current). The 8 year old phone needs nursing into a factory reset - immediately switch off auto updates to prevent th

I have 4 and 8 year old phones (besides my current). The 8 year old phone needs nursing into a factory reset - immediately switch off auto updates to prevent the normal installed apps loading (they are there as stubs only until then). The 4 year old one is better but still labours with modern apps. To be fair neither was more than utilitarian when I bought them. So I think the actual physical performance of the phone is more of an issue than the OS.