Nokia Lumia 638

Network

• Technology: GSM / HSPA / LTE
• 2G bands: GSM 850 / 900 / 1800 / 1900
• 3G bands: HSDPA 850 / 900 / 1900 / 2100 - RM-1010
• 4G bands: 3, 7, 38, 39, 40, 41
• Speed: HSPA 42.2/5.76 Mbps, LTE Cat4 150/50 Mbps

Launch

• Announced: 2014, December. Released 2014, December
• Status: Discontinued

Body

• Dimensions: 129.5 x 66.7 x 9.2 mm (5.10 x 2.63 x 0.36 in)
• Weight: 136 g (4.80 oz)
• SIM: Micro-SIM

Display

• Type: IPS LCD
• Size: 4.5 inches, 55.8 cm2 (~64.6% screen-to-body ratio)
• Resolution: 480 x 854 pixels, 16:9 ratio (~218 ppi density)
• Protection: Corning Gorilla Glass 3
• Note: ClearBlack display

Platform

• OS: Microsoft Windows Phone 8.1
• Chipset: Qualcomm Snapdragon 400 (28 nm)
• CPU: Quad-core 1.2 GHz Cortex-A7
• GPU: Adreno 305

Memory

• Card slot: microSDXC (dedicated slot)
• Internal: 8GB 1GB RAM
• Note: eMMC 4.5

Main Camera

• Single: 5 MP, 1/4.0", AF
• Features: Panorama
• Video: Yes

Selfie camera

• Note: No

Sound

• Loudspeaker: Yes
• 3.5mm jack: Yes

Comms

• WLAN: Wi-Fi 802.11 b/g/n, DLNA, hotspot
• Bluetooth: 4.0, A2DP, LE/ aptX after WP8 Denim update
• GPS: Yes, with A-GPS, GLONASS
• NFC: No
• Radio: FM radio
• USB: microUSB 2.0

Features

• Sensors: Accelerometer

Battery

• Type: Li-Ion 1830 mAh, removable (BL-5H)

Misc

• Colors: Black
• SAR EU: 1.46 W/kg (head)     0.95 W/kg (body)    
• Price: About 100 EUR