Vivo X21 vs Vivo X20
| Type | Touch | Touch |
| Dimensions | 154.45 x 74.78 x 7.37 mm | 155.85 x 75.15 x 7.20 mm |
| Weight | 156.20 g | 159.00 g |
| Display size | 6.28" | 6.01" |
| Display | Color / Super AMOLED 16M colors 1080 x 2280 px (6.28") 402 ppi | Color / Super AMOLED 16M colors 1080 x 2160 px (6.01") 402 ppi |
| Display protection | Corning Gorilla Glass Buy screen protector
| |
| Additional display | ||
| Protection of the secondary display | ||
| Standard battery | Li-Ion 3200 mAhBuy powerbank
| Li-Ion 3245 mAhBuy powerbank
|
| Quick battery charging | ||
| Wireless battery charging | ||
| Internal memory | 64 GB, 128 GB | 64 GB |
| RAM memory | 6 GB | 4 GB |
| Memory cards | microSD, microSDHC, microSDXC up to 256 GBBuy memory card | microSD, microSDHC, microSDXC up to 256 GBBuy memory card |
| Operating system | Android 8.1 Oreo | Android 7.1.1 Nougat |
| Interface | Funtouch 4.0 | Funtouch 3.2 |
| Processor | Qualcomm Snapdragon 660 | Qualcomm Snapdragon 660 |
| Processor clock | 2200 MHz | 2200 MHz |
| GPU | Adreno 512 | Adreno 512 |
| Touchscreen | ||
| DualSIM | ||
| SIM cards standard | DualSIM(nanoSIM, nanoSIM) | |
| DualSIM mode | dual standby | dual standby |
| Hybrid DualSIM | ||
| Announced | 1Q 2018 | 3Q 2017 |
| Other names | - | - |
| GSM frequencies | 850 900 1800 1900 | 850 900 1800 1900 |
| UMTS | 850 900 1900 2100 | 850 900 1900 2100 |
| LTE standard | FDD LTE: 2100, 1900, 1800, 1700, 900, 850 TDD LTE: 2600, 2500, 2300, 2100, 1900 | FDD LTE: 2600, 2100, 1900, 1800, 900, 850 TDD LTE: 2600, 2500, 2300, 1900 |
| CDMA | 850 | 850 |
| Standard TD-SCDMA | 1900 2000 | 1900 2000 |
| UMA |

