Samsung Galaxy Z Fold 2 (SM-F916B) - Specs | PhoneMore
With one SIM card slot, the Samsung Galaxy Z Fold 2 (SM-F916U1) allows download up to 5000 Mbps for internet browsing, but it also depends on the carrier.
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An advantage of the Samsung Galaxy Z Fold 3 (SM-F926B 512GB) is the possibility of using two mobile carriers, a device with two SIM card slots.
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There's no microSD card slot on the Galaxy Z Fold 4 but it does come with a higher 1TB onboard storage variant available exclusively from Samsung.