z fold 3 sd card slot: Samsung Galaxy Z Fold 3 (SM-F926B 512GB) - Specs | PhoneMore. There's no microSD card slot on the Samsung Galaxy Z Fold 4 - SamMobile. How to insert USIM card into Galaxy Z Flip 6 or Flip 5 & Fold 6 or Fold 5 | Samsung UK.
Unfortunately, Galaxy Z Fold 3 and Galaxy Z Flip 3 Have Single SIM Support in the U.S.
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. - SamMobile
Learn how to correctly insert a USIM Card into your Samsung Galaxy Z Flip 6 or Flip 5 and Z Fold 6 or Fold 5 with our easy guide.