| Nokia Lumia 638 |
Xiaomi Redmi Note 9 Pro |
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| Hardware and OS | Nokia Lumia 638 | Xiaomi Redmi Note 9 Pro |
| Operating system | Microsoft Windows Phone 8.1 | Android 10.0; MIUI 11 |
| Processor | Quad-core 1.2 GHz Cortex-A7 | Octa-core (2x2.3 GHz Kryo 465 Gold & 6x1.8 GHz Kryo 465 Silver) |
| Chipset | Qualcomm Snapdragon 400 (28 nm) | Qualcomm SM7125 Snapdragon 720G (8 nm) |
| GPU | Adreno 305 | Adreno 618 |
| Internal memory | 8 GB, 1 GB RAM | 64GB 4GB RAM, 128GB 6GB RAM |
| External memory | microSD, up to 256 GB (dedicated slot) | microSDXC (dedicated slot) |
| Display | Nokia Lumia 638 | Xiaomi Redmi Note 9 Pro |
| Type | IPS LCD | IPS LCD |
| Size | 4.5" inc | 6.67" inc |
| Resolution | 480 x 854 px | 1080 x 2400 px |
| Protection | Corning Gorilla Glass 3 | Corning Gorilla Glass 5 |
| Touchscreen | capacitive touchscreen | capacitive touchscreen |
| Screen-to-Body Ratio | 64.6% | 84.5% |
| Display area | 55.8 cm2 | 107.4 cm2 |
| Display aspect ratio | 16:9 (height:width) | 20:9 (height:width) |
| Pixel Density | 218 PPI | 395 PPI |
| Colors | 16M | 16M |
| Other | ClearBlack display | 450 nits typ. brightness (advertised) |
| Connectivity | Nokia Lumia 638 | Xiaomi Redmi Note 9 Pro |
| 2G Network | GSM 850 / 900 / 1800 / 1900 | GSM 850 / 900 / 1800 / 1900 - SIM 1 & SIM 2 |
| 3G Network | HSDPA 850 / 900 / 1900 / 2100 - RM-1010 | HSDPA 850 / 900 / 1900 / 2100 |
| 4G Network | LTE band 3(1800), 7(2600), 38(2600), 39(1900), 40(2300), 41(2500) | LTE band 1(2100), 3(1800), 5(850), 8(900), 40(2300), 41(2500) |
| Wi-Fi | Wi-Fi 802.11 b/g/n, DLNA, hotspot | Wi-Fi 802.11 a/b/g/n/ac, dual-band, Wi-Fi Direct, hotspot |
| Network | GSM / HSPA / LTE | GSM / HSPA / LTE |
| SIM card | Micro-SIM | Dual SIM (Nano-SIM, dual stand-by) |
| Bluetooth | 4.0, A2DP, LE/ aptX after WP8 Denim update | 5.0, A2DP, LE |
| Edge | Yes | Yes |
| GPRS | Yes | Yes |
| GPS | Yes, with A-GPS, GLONASS | Yes, with A-GPS, GLONASS, GALILEO, BDS, NavIC |
| Speed | HSPA 42.2/5.76 Mbps, LTE Cat4 150/50 Mbps | HSPA 42.2/5.76 Mbps, LTE-A |
| USB | microUSB 2.0 | 2.0, Type-C 1.0 reversible connector |
| Camera | Nokia Lumia 638 | Xiaomi Redmi Note 9 Pro |
| Main camera | 5 MP, Single | 48 MP, Quad |
| Specs | 5 MP, 1/4', AF | 48 MP, f/1.8, (wide), 1/2.25", 0.8µm, PDAF -8 MP, f/2.2, 13mm (ultrawide), 1/4.0", 1.12µm -5 MP, f/2.4, (macro), 1.12µm -2 MP, f/2.4, (depth) |
| Features | Panorama | LED flash, HDR, panorama |
| Video | Yes | 2160p@30fps, 1080p@30/60/120fps, 720p@960fps, gyro-EIS |
| Selfie camera | 16 MP, Single | |
| Multimedia | Nokia Lumia 638 | Xiaomi Redmi Note 9 Pro |
| 3.5 mm Jack | Yes | Yes |
| Radio | FM radio | FM radio, recording |
| Design | Nokia Lumia 638 | Xiaomi Redmi Note 9 Pro |
| Colors | Black | Aurora Blue, Glacier White, Interstellar Black |
| Dimensions | 129.5 x 66.7 x 9.2 mm | 165.8 x 76.7 x 8.8 mm |
| Weight | 136 g | 209 g |
| Body build | Glass front (Gorilla Glass 5), glass back (Gorilla Glass 5), plastic frame | |
| Battery | Nokia Lumia 638 | Xiaomi Redmi Note 9 Pro |
| Battery capacity | 1830 mAh, Removable Li-Ion | 5020 mAh, Non-removable Li-Po |
| Other | Nokia Lumia 638 | Xiaomi Redmi Note 9 Pro |
| SAR | SAR EU - 1.46 W/kg (head), 0.95 W/kg (body) | |
| Release date | 2014, December | 2020, March 12 |
| Sensors | Accelerometer | Fingerprint (side-mounted), accelerometer, gyro, proximity, compass , Infrared port |
