Vivo Y31 5G vs Vivo Y21d
| Type | Touch | Touch |
| Waterproofness & dust-resistance | IP68, IP69 | IP68, IP69 |
| Dimensions | 166.14 x 77.01 x 8.39 mm | 166.14 x 77.01 x 8.39 mm |
| Weight | 209.00 g | 209.00 g |
| Display size | 6.68" | 6.68" |
| Display | Color / IPS TFT 16,7M colors 120 Hz 720 x 1608 px (6.68") 264 ppi | Color / IPS TFT 16,7M colors 90 Hz 720 x 1608 px (6.68") 264 ppi |
| Display protection |   | Corning Gorilla Glass Buy screen protector
|
| Additional display |  | |
| Protection of the secondary display | | |
| Standard battery | Li-Po 6500 mAhBuy powerbank
| Li-Ion 6500 mAhBuy powerbank
|
| Quick battery charging | | |
| Wireless battery charging | | |
| Internal memory | 128 GB | 128 GB, 256 GB |
| RAM memory | 4 GB, 6 GB | 4 GB, 6 GB |
| Memory cards | microSD, microSDHC, microSDXC up to 2000 GBBuy memory card | microSD, microSDHC, microSDXC up to 2000 GBBuy memory card |
| Operating system | Android 15 | Android 15 |
| Interface | Funtouch 15 | Funtouch 15 |
| Processor | Qualcomm Snapdragon 4 Gen 2 SM4450 | Unisoc Tiger T612 T7225 |
| Processor clock | 2200 MHz | 1800 MHz |
| GPU | Adreno 613 | ARM Mali G57 @650 MHz |
| Touchscreen | | |
| SAR (10g) | 1,13 W/kg |  |
| DualSIM | | |
| SIM cards standard | DualSIM(nanoSIM, nanoSIM) | DualSIM(nanoSIM, nanoSIM) |
| DualSIM mode | dual standby | dual standby |
| Hybrid DualSIM | nanoSIM, microSD | |
| Announced | 3Q 2025 | 3Q 2025 |
| Other names | V2521 | - |
| GSM frequencies | 850 900 1800 | 850 900 1800 |
| UMTS | 850 900 2100 | 850 900 2100 |
| LTE standard | FDD LTE: 2100, 1800, 900, 850, 700 TDD LTE: 2600, 2500, 2300 | FDD LTE: 2600, 2100, 1800, 900, 850, 800, 700 TDD LTE: 3500, 2600, 2300 |
| Standard 5G | FDD 5G: 2100, 1800, 900, 850, 700 TDD 5G: 3700, 3500, 2300 | |
| CDMA | | |
| Standard TD-SCDMA | | |
| UMA | | |
CAMERAS - BACK
| First camera | | |
| Camera type | Standard | Standard |
| Photo matrix | 50 Mpx | 50 Mpx |
| Optical zoom | | |
| Flash | LED | LED |
| Dual-colour LED flash | | |
| Video resolution | | 1920x1080 px |
| Video formats | H.264, H.265, MPEG4 | H.264, H.265, MPEG4 |
| Additional | AF, f/1.8 | AF, f/1.8 |
| Second camera | | |
| Camera type | Depth of field | Depth of field |
| Photo matrix | 0.08 Mpx | 0.08 Mpx |
| Optical zoom | | |
| Flash | LED | LED |
| Dual-colour LED flash | | |
| Additional | FF, f/3.0 | FF, f/3.0 |
CAMERAS - FRONT
| First camera | | |
| Camera type | Portrait | Portrait |
| Photo matrix | 8 Mpx | 5 Mpx |
| Optical zoom | | |
| Flash | | |
| Dual-colour LED flash | | |
| Video resolution | | 1920x1080 px |
| Additional | FF, f/2.0 | 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 | 42.20 Mbit/s |
| HSUPA | 5.76 Mbit/s | 5.76 Mbit/s |
| HSPA | | |
| HSPA+ | | |
| LTE DL | | |
| LTE UP | | |
| WIMAX+ | | |
| GPRS | | |
| EDGE | | |
| Bluetooth | v4.2 | v5.2 |
| A2DP Profile | | |
| HDMI | | |
| WiFi | v802.11 a/b/g/n/ac | v802.11 a/b/g/n/ac |
| WiFi frequencies | 2,4 GHz; 5 GHz | 2,4 GHz; 5 GHz |
| WiFi Direct | | |
| WiFi Display | | |
| DLNA | | |
| Miracast | | |
| WiFi hotspot | | |
| IrDA | | |
| USB | v2.0 Type-C | v2.0 Type-C |
| 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 | 2 | 2 |
| Audio Jack | | |
| HD Voice | | |
| Sound formats | AAC, AAC+, AMR, APE, FLAC, MID, OGG, WAV, eAAC+ | AAC, AAC+, AMR, APE, FLAC, MID, OGG, WAV, eAAC+ |
| Polyphony | | |
| Video ringtone | | |
| Ring composer | | |
| Games | | |
| Java | ART | 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 | | |