Celkon A21 has display Size 4.0", operating system Android 4.2.2. The device has ram 256 GB too, card support is microSD, up to 32 GB, it has 512 MB, 256 MB RAM hard disk. Back camera 3.15 MP is awesome, front camera 1.3 MP is also not bad. A21 has power storage, Up to 8 h (3G). Device status is Available