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Microsoft Lumia 640 XL review: Windows Phone goes extra-large - Neowin
Microsoft at MWC 2015: Lumia 640 and 640 XL Announced, 4K 120Hz Surface Hub Demoed
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Review: Microsoft Lumia 640 XL | WIRED
Lumia 640: The best bang for your buck | Microsoft Devices Blog
Microsoft Lumia 640 Review | TechSpot
Tutorial: How to De-Brand your AT&T Lumia 640 LTE & Flash another ROM - Nokiapoweruser
Microsoft Lumia 640 vs Lumia 650 comparison: is it worth the upgrade? [Update] - Neowin
Microsoft Lumia 640: no apologies needed review - All About Windows Phone