I used the Palm Phone (PVG100) (3.3" screen) (basically the size of a credit card) [ https://www.ricklohre.com/wp-content/uploads/2020/01/dsc_097... ] as long as I could until it became too slow to use as software got slower and increasingly battery-hungry and I had to give it up last year.
Right now I have a Soyes S10Max, which has a 3.5" screen (same screen size as the original iPhone), but it's kinda chunky. https://www.amazon.com/dp/B0CRZ47T53?ref_=ppx_hzsearch_conn_...
The specs are more than strong enough to handle whatever I need on a daily basis. But I miss the slimmer size of the Palm Phone.
Right now I've pre-ordered this phone https://aiphor.com/products/bluefox-nx1-4-0-android-smartpho... with the 8gigram+128gig storage capacity. Has an even stronger cpu than the Soyes, but I am slightly worried about the resolution of 540x1168px because some elements may end up overlapping.
Even though it's 4", it has a tiny bezel so it's only slightly bigger than the Palm Phone, although a bit thicker cuz of a bigger battery. But still relatively slim, especially compared to the Soyes.
Front comparison: https://preview.redd.it/dtwnubx05scf1.png?width=3840&format=...
https://preview.redd.it/s2391amd7hbf1.png?width=320&crop=sma...
Will see!
If you check /r/smallphones I'll post a review of the NX1 in a couple months (or whenever I get it + a week or two). It looks like the closest spiritual successor to the Palm Phone (although the single button on the foot with multiple actions will probably never be beat)