Nokia Lumia 638 4G
| Type | Touch |
| Dimensions | 129.50 x 66.70 x 9.20 mm |
| Weight | 134.00 g |
| Display size | 4.50" |
| Display | Color / IPS TFT 16M colors 480 x 854 px (4.50") 218 ppi |
| Display protection | Corning Gorilla Glass Buy screen protector
 |
| Additional display |  |
| Protection of the secondary display | |
| Talk time (max.) | 2G: 720 min. (12.0 h) 3G: 840 min. (14.0 h) |
| Stand-by (max.) | 2G: 648 h. (27.0 days) 3G: 648 h. (27.0 days) |
| Playback time (max.) | Audio: 58 h (2.4 days) Video: 7 h (0.3 days) |
| Internet browsing time (max.) | WiFi: 9,4 h (0.4 days) 3G: 8,8 h (0.3 days) |
| Standard battery | Li-Ion 1830 mAhBuy powerbank
|
| Quick battery charging | |
| Wireless battery charging | |
| Internal memory | 8 GB |
| RAM memory | 1 GB |
| Memory cards |  microSD, microSDHC, microSDXC up to 128 GBBuy memory card |
| Operating system | MS Windows Phone 8.1 |
| Processor | Qualcomm Snapdragon 400 |
| Processor clock | 1200 MHz |
| GPU | Adreno 305 |
| Touchscreen | |
| DualSIM | |
| SIM cards standard | SingleSIM(microSIM) |
| Other names | RM-1010 |
| GSM frequencies | 850 900 1800 1900 |
| UMTS | 850 1900 2100 |
| LTE standard | FDD LTE: 2600, 1800 TDD LTE: 2600, 2500, 2300, 1900 |
| CDMA | |
| Standard TD-SCDMA | 1900 2000 |
| UMA | |
CAMERAS - BACK
| First camera | |
| Photo matrix | 5 Mpx |
| Resolution | 2592x1944 px |
| Optical zoom | |
| Digital zoom | 4x |
| Flash | |
| Dual-colour LED flash | |
| Video resolution | 1280x720 px |
| Video formats | H.264, MPEG4 - 30 fps |
| Additional | AF, f/2.4 |
CAMERAS - FRONT
SENSORS
| Accelerometer | |
| Proximity | |
| Light | |
| Magnetometer | |
| Gyroscope | |
| Barometer | |
| Altimeter | |
| Gravity | |
| Hall-effect | |
| Iris scanner | |
| Fingerprint scanner | |
| Thermometer | |
| Hygrometer | |
Data transfer
| xHTML | |
| WAP | 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 | v4.0 |
| A2DP Profile | |
| HDMI | |
| WiFi | v802.11 b/g/n |
| WiFi frequencies | 2,4 GHz |
| WiFi Direct | |
| WiFi Display | |
| DLNA | |
| Miracast | |
| WiFi hotspot | |
| IrDA | |
| USB | v2.0 |
| GPS | |
| A-GPS | |
| GLONASS | |
| Beidou | |
| NFC | |
COMMUNICATION AND MESSAGING
| Call waiting | |
| Conferency | |
| Call forwarding | |
| Push To Talk | |
| Instant Messenger | |
| SMS | |
| EMS | |
| MMS | |
| Swype | |
| e-mail client | POP3, IMAP4, SMTP |
| Hardware QWERTY keyboard | |
| RSS Reader | |
Multimedia
| Radio | |
| MP3 | |
| Stereo speakers | |
| Audio Jack | 3.5 mm |
| HD Voice | |
| Sound formats | AAC, AMR, ASF, M4A, WMA |
| Polyphony | |
| Video ringtone | |
| Ring composer | |
| Games | |
| Java | |
| Videophone | |
| DVB-H television | |
| TV-Out | |
PIM AND ADDITIONAL FUNCTIONS
| Watch | |
| Alarm | |
| Calculator | |
| Currency converter | |
| Organizer | |
| Calendar | |
| Flight mode | |
| SyncML | |
| Data and fax | |
| Screensaver | |
| Themes | |
| Interchangeable covers | |
| Voice dial | |
| Speakerphone | |
| Recorder | |
| Vibrations | |