Lumia 640 (RM-1072): Specifications ,Price, Release date
Microsoft Lumia 640 XL Full Review With Camera Test, Specs, Features, Design & Display Quality - YouTube
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Microsoft Lumia 640 RM-1075 8GB Dual SIM Smartphone A00025377
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Microsoft Lumia 640 LTE Features and Specifications - THE SPECS
Microsoft Lumia 640 XL LTE Features and Specifications - THE SPECS