The Karbonn A21 Plus is the successor to the Karbonn A21.
OS and Processor
The Karbonn A21 Plus has a dual-core Qualcomm Snapdragon S4 Play clocked to 1Ghz and has 512MB of RAM available for multi-tasking. The A21 Plus will have out-of-the-box
Android Jelly Bean v4.2 which is a jump from the A21 which came pre-loaded with Ice Cream Sandwich.
Hardware
The Karbonn A21 Plus has an increased screen size boasting a 5-inch WVGA display with a resolution of 480x800 pixels. Besides the screen size increase, the guts of the A21 Plus remains the same as the predecessor, the Karbonn A21. The Karbonn A21 Plus has a 2000mAh Li-Ion battery. The handset, like the A21, is a dual SIM (GSM + WCDMA) phone with Dual Standby.
Camera and Memory
The A21 Plus has a 5-megapixel rear-camera with an LED flash and a VGA front-camera for video calling. The Karbonn A21 Plus has 4GB of internal storage of which 2.1GB is available for user storage and has a microSD card slot which allows for expansion upto 32GB.
Media and Connectivity
The Karbonn 21 Plus has access to the Google Play Store. It supports a variety of video and audio file formats and has FM Radio support. The A21 Plus a 3.5mm audio jack. For connectivity, the Karbonn A21 Plus has Wi-Fi, 2G, 3G Bluetooth 3.0, A-GPS, and microUSB v2.0.