| Hardware and OS Nokia Lumia 638 |
| Operating system: | Microsoft Windows Phone 8.1 |
| Processor: | Quad-core 1.2 GHz Cortex-A7 |
| Chipset: | Qualcomm Snapdragon 400 (28 nm) |
| GPU: | Adreno 305 |
| Internal memory: | 8 GB, 1 GB RAM |
| External memory: | microSD, up to 256 GB (dedicated slot) |
| Display Nokia Lumia 638 |
| Type: | IPS LCD |
| Size: | 4.5" inc |
| Resolution: | 480 x 854 px |
| Protection: | Corning Gorilla Glass 3 |
| Touchscreen: | capacitive touchscreen |
| Screen-to-Body Ratio: | 64.6% |
| Display area: | 55.8 cm2 |
| Display aspect ratio: | 16:9 (height:width) |
| Pixel Density: | 218 PPI |
| Colors: | 16M |
| Other: | ClearBlack display |
| Connectivity Nokia Lumia 638 |
| 2G Network: | GSM 850 / 900 / 1800 / 1900 |
| 3G Network: | HSDPA 850 / 900 / 1900 / 2100 - RM-1010 |
| 4G Network: | LTE band 3(1800), 7(2600), 38(2600), 39(1900), 40(2300), 41(2500) |
| Wi-Fi: | Wi-Fi 802.11 b/g/n, DLNA, hotspot |
| Network: | GSM / HSPA / LTE |
| SIM card: | Micro-SIM |
| Bluetooth: | 4.0, A2DP, LE/ aptX after WP8 Denim update |
| Edge: | Yes |
| GPRS: | Yes |
| GPS: | Yes, with A-GPS, GLONASS |
| Speed: | HSPA 42.2/5.76 Mbps, LTE Cat4 150/50 Mbps |
| USB: | microUSB 2.0 |
| Camera Nokia Lumia 638 |
| Main camera: | 5 MP,
Single |
| Specs: | 5 MP, 1/4', AF |
| Features: | Panorama |
| Video: | Yes |
| Multimedia Nokia Lumia 638 |
| 3.5 mm Jack: | Yes |
| Radio: | FM radio |
| Design Nokia Lumia 638 |
| Colors: | Black |
| Dimensions: | 129.5 x 66.7 x 9.2 mm |
| Weight: | 136 g |
| Battery Nokia Lumia 638 |
| Battery capacity: | 1830 mAh, Removable Li-Ion |
| Other Nokia Lumia 638 |
| SAR: | SAR EU - 1.46 W/kg (head), 0.95 W/kg (body) |
| Release date: | 2014, December |
| Sensors: | Accelerometer |
