Microsoft Lumia 640 (5-inch) Smartphone (RM-1073) AT&T ONLY - 8GB/Blac
Microsoft Lumia 640 review: Big screen and great camera make a brilliant budget phone - CNET
ROMs for the Lumia 635 1GB show up on Microsoft's servers - MSPoweruser
Nokia Lumia 640 (Unlocked, Like New ) - Mr Aberthon
Microsoft Lumia 640 LTE - Full phone specifications
Microsoft provides additional detail on Lumia 950 and 950XL cameras: Digital Photography Review
Amazon.com: Microsoft Nokia Lumia 640 LTE RM-1072 8GB 5" Unlocked GSM Windows 8MP Camera Smartphone - Black - International Version No Warranty : Cell Phones & Accessories
UnLocked Microsoft Nokia Lumia 640 4G LTE 5.0" 8GB 8MP Cam Windows 8 Smartphone | eBay