Depends on budget really, but, for me, the S25 is the best small phone - but it may have a host of features that you don't need or be at a price level that is beyond your means. So, other than size, what is important to you?
Samsung Flip
Thanks Orcvader i'll check them outIf you want it super compact, there's the Samsung Flip or Moto Razr phones. Depends on your budget though, but I believe the Razr ones at least are on the more affordable side.
Thanks dr-shoe:same again will check them outSecond the post above about the samsung s25, but if you're on a budget, getting a refurbished S24 or even S23 would be great value.