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.

Recovery Mode on the Celkon A21 is a special bootable partition that operates independently from the main Android system. It allows you to perform advanced operations including cache wipes, factory resets, and software repairs even when the phone cannot boot normally. Access it carefully as some options will erase all data.

Used for cache wipes, factory resets, and advanced repairs.