Nokia N81 vs Realme C21Y
| Type | Slide | Touch |
| Dimensions | 102.00 x 50.00 x 17.90 mm | 164.50 x 76.00 x 9.10 mm |
| Weight | 140.00 g | 194.00 g |
| Display size | 2.40" | 6.50" |
| Display | Color / TFT 16M colors 240 x 320 px (2.40") 167 ppi | Color / IPS TFT 16M colors 60 Hz 720 x 1600 px (6.50") 270 ppi |
| Display protection |   | Corning Gorilla Glass Buy screen protector
|
| Additional display | | |
| Protection of the secondary display | | |
| Talk time (max.) | 2G: 240 min. (4.0 h) |  |
| Stand-by (max.) | 2G: 408 h. (17.0 days) | |
| Standard battery | Li-Ion 1050 mAhBuy powerbank
| Li-Po 5000 mAhBuy powerbank
|
| Quick battery charging | |  |
| Wireless battery charging | | |
| Internal memory | 12 MB | 32 GB, 64 GB |
| End-user memory | | 44 GB |
| RAM memory | | 3 GB, 4 GB |
| Memory cards | microSD, microSDHC up to 8 GBBuy memory card | microSD, microSDHC, microSDXC up to 256 GBBuy memory card |
| Operating system | Symbian 9.2 | Android 11 |
| Interface | Series 60 3rd Edition | realme UI |
| Processor | ARM11 | Unisoc Tiger T610 UMS512 |
| Processor clock | 369 MHz | 1800 MHz |
| GPU | - | ARM Mali G52 MP2 @614 MHz |
| Touchscreen | | |
| SAR (10g) | 0,96 W/kg | |
| DualSIM | | |
| SIM cards standard | | DualSIM(nanoSIM, nanoSIM) |
| DualSIM mode | nd | dual standby |
| Hybrid DualSIM | nd | |
| Announced | | 2Q 2021 |
| Other names | - | RMX3261; RMX3263 |
| GSM frequencies | 850 900 1800 1900 | 850 900 1800 1900 |
| UMTS | 2100 | 850 900 2100 |
| LTE standard | | FDD LTE: 2600, 2100, 1800, 900, 850, 800, 700 TDD LTE: 2600, 2500, 2300 |
| Standard 5G | | |
| CDMA | | |
| Standard TD-SCDMA | | |
| UMA | | |
CAMERAS - BACK
| First camera | | |
| Camera type | | Standard |
| Photo matrix | 2 Mpx | 13 Mpx |
| Pixel size | | 1,12 µm |
| Resolution | 1600x1200 px | |
| Optical zoom | | |
| Digital zoom | 20x | 4x |
| Number of lenses | | 5 |
| Flash | LED | LED |
| Dual-colour LED flash | | |
| Video resolution | 320x240 px | 1920x1080 px |
| Video formats | H.263, MPEG4 - 15 fps | H.263, H.264, MPEG4 - 30 fps |
| Additional | - | AF, f/2.2 |
| Second camera | | |
| Camera type | nd | Macro |
| Photo matrix | nd | 2 Mpx |
| Optical zoom | nd | |
| Number of lenses | nd | 3 |
| Flash | nd | LED |
| Dual-colour LED flash | nd | |
| Video formats | nd | H.263, H.264, MPEG4 - 30 fps |
| Additional | nd | FF, f/2.4 |
| Third camera | | |
| Camera type | nd | Depth of field |
| Photo matrix | nd | 2 Mpx |
| Optical zoom | nd | |
| Number of lenses | nd | 3 |
| Flash | nd | |
| Dual-colour LED flash | nd | |
| Video formats | nd | H.263, H.264, MPEG4 - 30 fps |
| Additional | nd | FF, f/2.4 |
CAMERAS - FRONT
| First camera | | |
| Camera type | | Portrait |
| Photo matrix | | 5 Mpx |
| Resolution | 320x240 px | |
| Optical zoom | | |
| Digital zoom | 2x | |
| Number of lenses | | 3 |
| Flash | | |
| Dual-colour LED flash | | |
| Video formats | H.263, MPEG4 - 15 fps | H.263, H.264, MPEG4 - 30 fps |
| Additional | - | FF, f/2.2 |
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 | | 42.20 Mbit/s |
| HSUPA | | 5.76 Mbit/s |
| HSPA | | |
| HSPA+ | | |
| LTE DL | | - |
| LTE UP | | 51.00 Mbit/s |
| WIMAX+ | | |
| GPRS | | |
| EDGE | | |
| Bluetooth | v2.0 | v5.0 |
| A2DP Profile | | |
| HDMI | | |
| WiFi | v802.11 b/g | 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 | | |
| Galileo | | |
| QZSS | | |
| NFC | | |
COMMUNICATION AND MESSAGING
| Call waiting | | |
| Conferency | | |
| Call forwarding | | |
| Push To Talk | | |
| Instant Messenger | | |
| SMS | | |
| EMS | | |
| MMS | | |
| Dictionary | T9 | T9 |
| 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, AMR, M4A, MP4, MXMF, RA, WAV, WMA, eAAC+ | AAC, AAC+, AMR, APE, FLAC, MID, MKA, OGG, WAV, WMA, eAAC+ |
| Polyphony | 64 voices | |
| Video ringtone | | |
| Ring composer | | |
| Games | | |
| Java | MIDP 2.0 | ART |
| 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 | | |