Nokia Lumia 521 vs Nokia Lumia 520
| Type | Touch | Touch |
| Dimensions | 124.00 x 64.00 x 9.90 mm | 119.90 x 64.00 x 9.90 mm |
| Weight | 124.50 g | 124.00 g |
| Display size | 4.00" | 4.00" |
| Display | Color / IPS TFT 16M colors 480 x 800 px (4.00") 233 ppi | Color / IPS TFT 16M colors 480 x 800 px (4.00") 233 ppi |
| Display protection |   | |
| Additional display | | |
| Protection of the secondary display | | |
| Talk time (max.) | 2G: 480 min. (8.0 h) 3G: 540 min. (9.0 h) | 2G: 888 min. (14.8 h) 3G: 576 min. (9.6 h) |
| Stand-by (max.) | 3G: 400 h. (16.7 days) | 3G: 360 h. (15.0 days) |
| Playback time (max.) | Audio: 45 h (1.9 days) | Audio: 52 h (2.2 days) Video: 5,9 h (0.2 days) |
| Internet browsing time (max.) | nd | WiFi: 7,3 h (0.3 days) |
| Standard battery | Li-Ion 1430 mAhBuy powerbank
| Li-Ion 1430 mAhBuy powerbank
|
| Quick battery charging | | |
| Wireless battery charging | | |
| Internal memory | 8 GB | 8 GB |
| RAM memory | 512 MB | 512 MB |
| Memory cards |  microSD, microSDHC, microSDXC up to 64 GBBuy memory card | microSD, microSDHC, microSDXC up to 64 GBBuy memory card |
| Operating system | MS Windows Phone 8.1 | MS Windows Phone 8 |
| Processor | Qualcomm MSM8227 | Qualcomm MSM8227 |
| Processor clock | 1000 MHz | 1000 MHz |
| GPU | Adreno 305 | Adreno 305 |
| Touchscreen | | |
| DualSIM | | |
| SIM cards standard | SingleSIM(microSIM) | SingleSIM(microSIM) |
| Other names | - | - |
| GSM frequencies | 850 900 1800 1900 | 850 900 1800 1900 |
| UMTS | 850 1700 1900 2100 | 900 2100 |
| LTE standard | | |
| CDMA | | |
| Standard TD-SCDMA | | |
| UMA | | |
CAMERAS - BACK
| First camera | | |
| Photo matrix | 5 Mpx | 5 Mpx |
| Resolution |  | 2592x1936 px |
| Optical zoom | | |
| Digital zoom | | 4x |
| Flash | | |
| Dual-colour LED flash | | |
| Video resolution | 1280x720 px | 1280x720 px |
| Video formats | H.263, H.264, MPEG4 - 30 fps | H.263, H.264, MPEG4 - 30 fps |
| Additional | AF, f/2.4 | f/2.4 |
CAMERAS - FRONT
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 | 21.10 Mbit/s | 21.10 Mbit/s |
| HSUPA | 5.76 Mbit/s | 5.76 Mbit/s |
| HSPA | | |
| HSPA+ | | |
| LTE DL | | |
| LTE UP | | |
| WIMAX+ | | |
| GPRS | | |
| EDGE | | |
| Bluetooth | v3.0 | v3.0 |
| A2DP Profile | | |
| HDMI | | |
| WiFi | v802.11 b/g/n | v802.11 b/g/n |
| WiFi frequencies | 2,4 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 | OTHER | OTHER |
| Swype | | |
| e-mail client | POP3, IMAP4, SMTP | POP3, IMAP4, SMTP |
| Hardware QWERTY keyboard | | |
| RSS Reader | | |
Multimedia
| Radio | | |
| MP3 | | |
| Stereo speakers | | |
| Audio Jack | 3.5 mm | 3.5 mm |
| HD Voice | | |
| Sound formats | AAC, AAC+, AMR, WAV, eAAC+ | AAC, AAC+, AMR, WAV, WMA |
| Polyphony | | |
| Video ringtone | | |
| Ring composer | | |
| Games | | |
| Java | MIDP 1.0 | |
| 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 | | |