Asus Zenfone 3 Ultra has display Size 6.8", operating system Android 6.1; ZenUI 3. The device has ram 4 GB too, card support is microSD, up to 256 GB (uses shared SIM slot), it has 32/64/128 GB, 3/4 GB RAM hard disk. Back camera 23 MP is awesome, front camera 8 MP is also not bad. Zenfone 3 Ultra has power storage, Up to 34 h (3G). Device status is Available