Vivo X21 Ud has display Size 6.28", operating system Android 8.1; Funtouch 4. The device has ram 6 GB too, card support is microSD, up to 256 GB (uses shared SIM slot), it has 128 GB, 6 GB RAM hard disk. Back camera 12 MP is awesome, front camera 12 MP is also not bad. X21 Ud has power storage, . Device status is Available