The smartphone will be available worldwide beginning late-September.

The smartphone packs a 64-bit octa-core Qualcomm Snapdragon 615 SoC (1.5GHz quad-core + 1.0GHz quad-core) coupled with 2GB of RAM.

The dual-SIM (Nano-SIM) HTC Desire 820 runs Android 4.4 KitKat with HTC Sense UI skinned on top. The smartphone is the successor to HTC Desire 816.  It features a 5.5-inch HD (720x1280 pixels) display.

The 16GB internal storage on the Desire 820 is expandable via microSD card (up to 128GB). Connectivity options on the handset include Wi-Fi, FM radio, Bluetooth, GPRS/ EDGE, GPS/ A-GPS, 3G and 4G LTE connectivity.

The Desire 820 packs a 13-megapixel (with f/2.2 lens) rear facing camera with LED flash and BSI sensor, apart from an 8-megapixel secondary front-facing camera.

The handset measures 157.7x78.74x7.74mm and weighs 155 grams. The HTC Desire 820 packs a 2600mAh battery which is rated to deliver up to 22.4 hours (3G) of talk time and 424 hours (3G) of standby time.

HTC has said that with the Snapdragon 615 processor, the HTC Desire 820 will offer 'lightning-fast Cat 4 4G connectivity at speeds of up to 150Mbps.' It also supports HTC's Dot View case which will provide 'instant access to your phone without opening the cover.