# Microsoft Lumia 640

> Windows Phone smartphone

**Wikidata**: [Q19406379](https://www.wikidata.org/wiki/Q19406379)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Microsoft_Lumia_640)  
**Source**: https://4ort.xyz/entity/microsoft-lumia-640

Here’s the structured knowledge entry for **Microsoft Lumia 640**:

---

## Summary  
The Microsoft Lumia 640 is a Windows Phone smartphone released in 2015, succeeding the Nokia Lumia 630 and 1320. It runs on Windows Phone 8.1 and is upgradable to Windows 10 Mobile, featuring a Qualcomm Snapdragon processor and expandable storage. Manufactured by Microsoft Mobile, it was positioned as a mid-range device with a focus on affordability and productivity.

## Key Facts  
- **Release date:** March 2, 2015  
- **Operating system:** Windows Phone 8.1 (upgradable to Windows 10 Mobile)  
- **Processor:** Qualcomm MSM8926 Snapdragon 400  
- **GPU:** Adreno 305  
- **Dimensions:** 141.3 mm (height) × 72.2 mm (width) × 8.8 mm (thickness)  
- **Weight:** 145 grams  
- **Battery:** 2500 mAh lithium-ion  
- **Storage:** 8 GB internal (expandable via microSD up to 128 GB)  
- **Predecessors:** Nokia Lumia 630, Nokia Lumia 1320  
- **Successor:** Microsoft Lumia 650  

## FAQs  
### Q: What operating system does the Microsoft Lumia 640 use?  
A: The Lumia 640 launched with Windows Phone 8.1 but is upgradable to Windows 10 Mobile, offering access to Microsoft's productivity apps and services.  

### Q: Can the storage on the Lumia 640 be expanded?  
A: Yes, it supports microSD cards up to 128 GB, supplementing its 8 GB internal storage.  

### Q: Is the Lumia 640 dual-SIM compatible?  
A: Yes, dual-SIM variants were available, catering to users needing multiple network connections.  

## Why It Matters  
The Microsoft Lumia 640 represented Microsoft's effort to maintain a foothold in the smartphone market after acquiring Nokia's mobile division. Positioned as an affordable mid-range device, it targeted budget-conscious users seeking Windows Phone's integration with Microsoft services like Office and OneDrive. Despite stiff competition from Android and iOS, the Lumia 640 was praised for its build quality and value. Its release marked a transitional phase for Microsoft's mobile strategy, bridging Nokia's legacy with Microsoft's vision before the eventual decline of Windows Phone.  

## Notable For  
- **Upgradability:** One of the last Lumia devices officially supported for Windows 10 Mobile.  
- **Affordability:** Priced at $179.99 at launch, offering strong specs for its tier.  
- **Dual-SIM options:** Provided flexibility for international travelers or multi-carrier users.  
- **Microsoft branding:** Among the first Lumia models to drop the Nokia name after Microsoft's acquisition.  

## Body  
### Hardware Specifications  
- **CPU:** Qualcomm MSM8926 Snapdragon 400 (quad-core 1.2 GHz)  
- **GPU:** Adreno 305  
- **Display:** 5-inch IPS LCD, 720p resolution  
- **RAM:** 1 GB  
- **Camera:** 8 MP rear, 1 MP front  

### Software and Features  
- **Pre-installed OS:** Windows Phone 8.1  
- **Upgrade path:** Eligible for Windows 10 Mobile  
- **Microsoft integration:** Cortana, Office Mobile, OneDrive  

### Variants and Availability  
- **Models:** Single-SIM and dual-SIM LTE variants  
- **Market focus:** Primarily released in the United States  

### Legacy  
- **Successor:** Replaced by the Lumia 650 in 2016  
- **Discontinuation:** Marked the end of Microsoft's mid-range Lumia lineup  

## Schema Markup  
```json
{
  "@context": "https://schema.org",
  "@type": "Product",
  "name": "Microsoft Lumia 640",
  "description": "A Windows Phone smartphone released by Microsoft Mobile in 2015.",
  "brand": {
    "@type": "Brand",
    "name": "Microsoft"
  },
  "manufacturer": "Microsoft Mobile",
  "releaseDate": "2015-03-02",
  "operatingSystem": "Windows Phone 8.1, Windows 10 Mobile",
  "processor": "Qualcomm MSM8926 Snapdragon 400",
  "storageCapacity": "8 GB",
  "url": "http://www.microsoft.com/en/mobile/phone/lumia640-lte/",
  "sameAs": [
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}