HTC Desire 820 vs HTC Desire 620
| Type | Touch | Touch |
| Dimensions | 157.70 x 78.74 x 7.74 mm | 150.00 x 72.70 x 9.60 mm |
| Weight | 155.00 g | 160.00 g |
| Display size | 5.50" | 5.00" |
| Display | Color / LCD 16M colors 720 x 1280 px (5.50") 267 ppi | Color / TFT 16M colors 720 x 1280 px (5.00") 294 ppi |
| Display protection |   | |
| Additional display | | |
| Protection of the secondary display | | |
| Talk time (max.) | 3G: 1344 min. (22.4 h) | 3G: 1152 min. (19.2 h) |
| Stand-by (max.) | 3G: 424 h. (17.7 days) | 3G: 525 h. (21.9 days) |
| Standard battery | Li-Po 2600 mAhBuy powerbank
| Li-Po 2100 mAhBuy powerbank
|
| Quick battery charging | | |
| Wireless battery charging | | |
| Internal memory | 16 GB | 8 GB |
| RAM memory | 2 GB | 1 GB |
| Memory cards |  microSD, microSDHC, microSDXC up to 128 GBBuy memory card | microSD, microSDHC, microSDXC up to 128 GBBuy memory card |
| Operating system | Android 4.4.2 KitKat | Android 4.4.4 KitKat |
| Interface | Sense | - |
| Processor | Qualcomm Snapdragon 615 8939 | Qualcomm Snapdragon 410 8916 |
| Processor clock | 1500 MHz | 1200 MHz |
| GPU | Adreno 405 | Adreno 306 |
| Touchscreen | | |
| DualSIM | | |
| SIM cards standard | SingleSIM(nanoSIM) | SingleSIM(microSIM) |
| Announced | 3Q 2014 | 4Q 2014 |
| Other names | - | - |
| GSM frequencies | 850 900 1800 1900 | 850 900 1800 1900 |
| UMTS | 850 900 1900 2100 | 850 900 2100 |
| LTE standard | FDD LTE: 2600, 2500, 2300, 2100, 1900, 1800, 900 | FDD LTE: 2600, 1800, 1500, 900 |
| CDMA | | |
| Standard TD-SCDMA | 1900 2000 | |
| UMA | | |
CAMERAS - BACK
| First camera | | |
| Photo matrix | 13 Mpx | 8 Mpx |
| Resolution | 4160x3120 px | 3264x2448 px |
| Optical zoom | | |
| Flash | LED | LED |
| Dual-colour LED flash | | |
| Video resolution | 1920x1080 px | 1920x1080 px |
| Video formats | H.263, H.264, MPEG4 | H.263, H.264, MPEG4 |
| Additional | AF, f/2.2 | AF |
CAMERAS - FRONT
| First camera | | |
| Photo matrix | 8 Mpx | 5 Mpx |
| Resolution | 3264x2448 px | 2592x1944 px |
| Optical zoom | | |
| Flash | | |
| Dual-colour LED flash | | |
| Video resolution | 1920x1080 px |  |
| Video formats | H.263, H.264, MPEG4 | H.263, H.264, MPEG4 |
| Additional | - | FF |
SENSORS
| Accelerometer | | |
| Proximity | | |
| Light | | |
| Magnetometer | | |
| Gyroscope | | |
| Barometer | | |
| Altimeter | | |
| Gravity | | |
| Hall-effect | | |
| Iris scanner | | |
| Fingerprint scanner | | |
| Thermometer | | |
| Hygrometer | | |
Data transfer
| xHTML | | |
| WAP | v2.0 | v2.0 |
| HSCSD | | |
| HSDPA | 42.00 Mbit/s | 42.00 Mbit/s |
| HSUPA | 5.76 Mbit/s | 5.76 Mbit/s |
| HSPA | | |
| HSPA+ | | |
| LTE DL | | |
| LTE UP | | |
| WIMAX+ | | |
| GPRS | | class 12 |
| EDGE | | |
| Bluetooth | v4.0 | v4.0 |
| A2DP Profile | | |
| HDMI | | |
| WiFi | v802.11 a/b/g/n | v802.11 b/g/n |
| WiFi frequencies | 2,4 GHz; 5 GHz | 2,4 GHz |
| WiFi Direct | | |
| WiFi Display | | |
| DLNA | | |
| Miracast | | |
| WiFi hotspot | | |
| IrDA | | |
| USB | v2.0 | v2.0 |
| GPS | | |
| A-GPS | | |
| GLONASS | | |
| Beidou | | |
| NFC | | |
COMMUNICATION AND MESSAGING
| Call waiting | | |
| Conferency | | |
| Call forwarding | | |
| Push To Talk | | |
| Instant Messenger | | |
| SMS | | |
| EMS | | |
| MMS | | |
| Dictionary | XT9 | XT9 |
| Swype | | |
| e-mail client | POP3, SMTP, IMAP4 | POP3, IMAP4, SMTP |
| Hardware QWERTY keyboard | | |
| RSS Reader | | |
Multimedia
| Radio | | |
| MP3 | | |
| Stereo speakers | 2 | |
| Audio Jack | 3.5 mm | 3.5 mm |
| HD Voice | | |
| Sound formats | AAC, AMR, M4A, OGG, WAV, WMA | AAC, AAC+, AMR, OGG, WAV, WMA, eAAC+ |
| Polyphony | 64 voices | 64 voices |
| Video ringtone | | |
| Ring composer | | |
| Games | | |
| Java | Dalvik | Dalvik |
| Videophone | | |
| DVB-H television | | |
| TV-Out | | |
PIM AND ADDITIONAL FUNCTIONS
| Watch | | |
| Stopwatch | | |
| Alarm | | |
| Calculator | | |
| Currency converter | | |
| Organizer | | |
| Calendar | | |
| Flight mode | | |
| SyncML | | |
| Data and fax | | |
| Screensaver | | |
| Themes | | |
| Interchangeable covers | | |
| Voice dial | | |
| Speakerphone | | |
| Recorder | | |
| Vibrations | | |