The Celkon A21 is a 2014 Android 4.2.2 smartphone powered by the Mediatek MT6582 (28 nm) with 256MB and 512MB internal storage. It features a 4.0", TFT, 320.0x480.0 display and is available in Black, Blue, Red.

The A21 is equipped with a Li-Ion 1500 mAh battery, a 15 MP, Yes main camera, a 3 MP front camera. The device uses a Dual SIM (Dual stand-by) configuration. It weighs 115.3 g.

Hard resetting your Celkon A21 via Recovery Mode will completely wipe all data, apps, accounts and settings, restoring the device to its original factory state. This is commonly used to fix persistent software issues, boot loops, prepare the phone for sale, or recover from a forgotten screen lock. Back up your data before proceeding as this cannot be undone.

All data will be permanently erased. Back up first.