Both version of the Microsoft phone Microsoft Lumia 640 (both single-SIM and dual-SIM) are getting the prices cut, making them attractive Windows 10 mobile phones. The price is now $79 for the unlocked 5-inch Windows 10 phone Lumia 640: https://www.amazon.com/Microsoft-Nokia-640-Unlocked-Smartphone/ Lumia 640 phones are updated to run Windows 10 Mobile OS even though they were launched with Windows Phone 8.1 with Lumia Denim in March 2015. The Microsoft Lumia 640 … more…