Microsoft's Lumia 640 and 640 XL: Budget Windows Phones with LTE
Upgrade your Microsoft Lumia 640 LTE to Windows 10 Mobile - YouTube
Official Windows 10 Mobile eligible devices list has batches of devices receiving the update - Nokiapoweruser
Windows 10 Mobile Build 10586.107 on Lumia 950 XL, 640 XL & 525: Installation, First impressions & Hands-on - Nokiapoweruser
Microsoft rolls out Windows 10 Mobile upgrade for select phones – GeekWire
Microsoft Lumia 640 LTE - Full phone specifications
Windows Phone 8.1 vs. Windows 10 Mobile on Microsoft Lumia 640 XL
Microsoft says some Lumia 640s can't install Windows 10 Technical Preview for phones - Neowin
Microsoft Lumia 640 XL review | Windows Central
An unofficial Windows 10 Mobile branch guide
You can install Windows 10 ARM on Lumia 950/XL with new third-party tool
Microsoft Lumia 640 review: The Moto G of the Windows world - Tech Advisor
Microsoft drops support for the Lumia 640 and 640 XL with the Windows 10 Mobile Fall Creators Update | Windows Central
I can't access the store after updating to win 10 on my lumia 640 : r/windowsphone
Review: Microsoft Lumia 640 XL | WIRED
Here are all the devices that can upgrade to Windows 10 Mobile - MSPoweruser
New Windows 10 Mobile update list of eligible devices surfaces - Nokiapoweruser
The Lumia 640 and 640 XL can't handle Microsoft's feature-packed Windows 10 Fall Creators Update - MSPoweruser
how to install windows 10 on Microsoft Lumia 640!? - YouTube
Windows Phones Most Likely To Get Windows 10 Mobile RS2 Build Next Week
Microsoft Lumia 640 XL 8GB Unlocked GSM Quad-Core WIndows Smartphone RM-1066 | eBay
Update your unsupported Nokia Lumia phone to the latest Windows 10 Mobile 6438158526976 | eBay
Amazon.com: 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 : Cell Phones & Accessories
The Lumia 640 and 640XL won't receive the Fall Creators Update
