I bought them until they stopped making them... My favorite phone was the Sony Xperia X Compact with a 4.6" screen. It had decent midrange specs and a great camera.
Asked ChatGPT for a list and got this: (the "UniHerz Jelly Max" and the "Qin3Ultra" look decent)
• Fonepia Q9 mini
– Display: ~4.0 inches (540p)
– Release: 2024
– Overview: A very pocketable device from a niche manufacturer, built for minimalists who value size over high‑end specs.
• Cubot KingKong mini 3
– Display: ~4.5 inches (480p)
– Release: 2024
– Overview: Engineered for durability and compactness, it fits easily in one hand or a small pocket.
• Doogee S mini
– Display: ~4.5 inches (480p)
– Release: 2024
– Overview: A rugged mini smartphone that offers the basics in a very small chassis.
• Blackview N6000
– Display: ~4.3 inches (540p)
– Release: 2024
– Overview: Known for its tough build, this phone packs essential smartphone functions into a tiny screen.
• 8849 Tank mini
– Display: ~4.3 inches (520p)
– Release: 2024
– Overview: Combines a robust (if no‑nonsense) design with an ultra‑compact form factor.
• Ulefone Mini 20T Pro
– Display: ~4.7 inches (720p, 90Hz)
– Release: 2024
– Note: This model offers a slightly larger screen and smoother performance; manufacturers in this segment are known to refresh their lines in early 2025, so a 2025 update is possible.
• Unihertz Jelly Max
– Display: ~5.0 inches (720p)
– Release: 2024
– Overview: Unihertz specializes in ultra‑compact designs, and while the Jelly Max launched in 2024, expect an updated version in 2025 as the brand continues to cater to fans of credit‑card‑sized smartphones.
• QIN 3 Ultra
– Display: ~5.0 inches (720p)
– Release: 2024
– Overview: A compact phone with modern features; there are indications that its series may see a refresh or an updated variant in 2025.
• NanoPhone
– Display: ~3.5 inches tall
– Release: Late 2024 (with promotional pricing and deals extending into early 2025)
– Overview: Marketed for minimalists and those wanting to reduce screen time, this ultra‑mini smartphone offers 4G and Wi‑Fi in a device that can literally fit in your wallet.