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OS Android 4.4.2 (KitKat), Upgradable to Android 6.0.1 (Marshmallow), HTC Sense 6.0 with HTC BlinkFeed news reader, HTC BoomSound equalizer & Dual SIM 4G setups
Chipset Qualcomm Snapdragon 615 MSM8939 (28 nm 64-bit 1.5GHz Octa-Core with 4x Cortex-A53 1.5GHz + 4x Cortex-A53 1.0GHz & Adreno 405 GPU @ 550MHz with 1080p Hardware Video Decoder + HTC BoomSound Audio DSP)
RAM 2GB High-Speed LPDDR3 RAM (2GB RAM Flagship!)
Storage 16GB Massive High-Speed Internal Storage (12.8GB User Accessible)
Display 5.5 inches • 720 x 1280 pixels (16:9, 267 ppi HD!)
Main camera 13.0 MP Main (f/2.2 aperture, BSI Sensor, Autofocus, LED flash, Face Detection, Panorama, HDR, 1080p@30fps video)
Selfie camera 8.0 MP Wide (88° Wide-angle lens, 1080p HD video for Video Calling)
Battery 2600 mAh High-Density Battery (Powers over 18 hours calling / 420 hours standby!), Micro-USB 2.0 charging • Non-removable Li-Po 2600 mAh (9.88 Wh)
Weight 155 g (5.47 oz)

Latest HTC Desire 820 Dual SIM user agents:

User Agent Browser Platform
Mozilla/5.0 (Linux; U; Android 4.4.4; ru-ru; HTC_Desire_820_dual_sim Build/KTU84P) AppleWebKit/534.30 (KHTML, like Gecko) Version/4.0 Mobile Safari/534.30 Android Browser Android 4Desire 820 Dual SIM
Mozilla/5.0 (Linux; Android 6.0.1; HTC Desire 820 dual sim) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/83.0.4103.83 Mobile Safari/537.36 Chrome Mobile 83 Android 6Desire 820 Dual SIM
Mozilla/5.0 (Linux; Android 6.0.1; HTC Desire 820 dual sim) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/81.0.4044.138 Mobile Safari/537.36 Chrome Mobile 81 Android 6Desire 820 Dual SIM
Mozilla/5.0 (Linux; Android 6.0.1; HTC Desire 820 dual sim Build/MMB29M) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/33.0.0.0 Mobile Safari/537.36 Chrome Webview 33 Android 6Desire 820 Dual SIM
Mozilla/5.0 (Linux; Android 6.0.1; HTC Desire 820 dual sim Build/MMB29M) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/66.0.3359.158 Mobile Safari/537.36 Chrome Mobile 66 Android 6Desire 820 Dual SIM
Mozilla/5.0 (Linux; Android 6.0.1; HTC Desire 820 dual sim Build/MMB29M) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/62.0.3202.84 Mobile Safari/537.36 Chrome Mobile 62 Android 6Desire 820 Dual SIM
Mozilla/5.0 (Linux; Android 6.0.1; HTC Desire 820 dual sim Build/MMB29M) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/52.0.2743.98 Mobile Safari/537.36 Chrome Mobile 52 Android 6Desire 820 Dual SIM
Mozilla/5.0 (Linux; Android 6.0.1; HTC Desire 820 dual sim Build/MMB29M) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/46.0.2490.76 Mobile Safari/537.36 Chrome Mobile 46 Android 6Desire 820 Dual SIM
Mozilla/5.0 (Linux; Android 5.0.2; HTC Desire 820 dual sim) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/95.0.4638.74 Mobile Safari/537.36 Chrome Mobile 95 Android 5Desire 820 Dual SIM
Mozilla/5.0 (Linux; Android 5.0.2; HTC Desire 820 dual sim) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/87.0.4280.141 Mobile Safari/537.36 Chrome Mobile 87 Android 5Desire 820 Dual SIM
Mozilla/5.0 (Linux; Android 5.0.2; HTC Desire 820 dual sim) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/81.0.4044.138 Mobile Safari/537.36 Chrome Mobile 81 Android 5Desire 820 Dual SIM
Mozilla/5.0 (Linux; Android 4.4.4; HTC_Desire_820_dual_sim Build/KTU84P) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/38.0.0.0 Mobile Safari/537.36 Chrome Webview 38 Android 4Desire 820 Dual SIM
Mozilla/5.0 (Linux; Android 4.4.4; HTC Desire 820 dual sim) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/81.0.4044.138 Mobile Safari/537.36 Chrome Mobile 81 Android 4Desire 820 Dual SIM
Mozilla/5.0 (Linux; Android 4.4.4; HTC Desire 820 dual sim) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/79.0.3945.93 Mobile Safari/537.36 Chrome Mobile 79 Android 4Desire 820 Dual SIM
Mozilla/5.0 (Linux; Android 4.4.4; HTC Desire 820 dual sim) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/74.0.3729.112 Mobile Safari/537.36 Chrome Mobile 74 Android 4Desire 820 Dual SIM
Mozilla/5.0 (Linux; Android 4.4.4; HTC Desire 820 dual sim Build/KTU84P) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/65.0.3325.109 Mobile Safari/537.36 Chrome Mobile 65 Android 4Desire 820 Dual SIM
Mozilla/5.0 (Linux; Android 4.4.4; HTC Desire 820 dual sim Build/KTU84P) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/45.0.2454.84 Mobile Safari/537.36 Chrome Mobile 45 Android 4Desire 820 Dual SIM