I would like to buy a smartphone for less than 150 €. I like the idea more to get an older smartphone which was great at that time than a new and cheap one for a few reasons, e.g. sustainability.
But there is one big problem with old smartphone: There are no updates. Even the Samsung Galaxy S8 seems not to be updated anymore. Are there manufacturers who guarantee updates for the next few years? Or is there an easy way to install an Android distribution which is updated for a few years. I always had bad experiences with those not official distributions in the past, but it was some years ago.