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Microsoft's Lumia 640 and 640 XL are its new budget phone stars | Engadget
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Nokia: The Story of the Once-Legendary Phone Maker | TechSpot
Lumia 640 4G LTE Smartphone, 6764A with 8GB Memory Cell GoPhone - Black - Compatible with Microsoft Nokia 8.1 Phones -Carrier Locked to AT&T Wireless
Microsoft's Lumia 640 and 640 XL are its new budget phone stars | Engadget
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Microsoft Lumia 640 Review | Trusted Reviews
Microsoft announces end of support for Windows 10 Mobile, asks users to shift to Android, iOS | Technology News,The Indian Express
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Review: T-Mobile Nokia Lumia 521 | Windows Central
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