The Zen M21 is a basic dual SIM phone with a 2.8-inch TFT display and a resolution of 240 x 320 pixels.The device has a camera of 1.3MP with digital zoom. It is a very light weight phone at just 98g.
The phone has a very low inbuilt memory of only 30MB which can be expanded up to 16GB with an external memory card. The Zen M21 is powered by a 1,000mAH Li-ion battery which gives a talk time of up to 6 hours and has a standby time of up to 250 hours. It also supports GPRS for browsing the internet. It has Bluetooth and USB for connecting it to other devices.
The Zen M21 is a multimedia phone with FM Radio that can be plugged with a 3.5 mm audio jack. It has a FM recording feature and can be played on loudspeaker as well.
The Zen M21 is a basic phone which supports GPRS. It is especially recommended for those who want a compact phone with decent battery backup for mainly making calls.