5.9-6.1 are the smallest android phones out there. I suppose the
Z-Flip could be considered smaller when closed but opened it is definitely a large device too. If you want to switch to android that's fine but your 15Pro is already the same size as the smallest android options so I really don't see how it would make any difference. Small phones are not what phone manufacturers are interested in at this point in time. It's such a small market and they know what the vast majority of their customers want which is larger devices.. The iPhone 13 mini is still considered the best small phone available at this time, not sure why you got rid of yours, maybe buy another?