There are not many choices for actual dumbphones meaning not running Android. Most of the flip phones I see advertised as dumbphones are still running Android, still have all the Google cruft, still have distractions just much harder to see the screen. The two models of actual dumbphones I have seen are targeting senior citizens and are 4G which is fine provided 4G does not get deprecated any time soon. T-Mobile will start phasing out 4G in 2028 and that will be completed by 2035.