The new dual-SIM Lumia 640 and Lumia 640 XL smartphones allow you to have two numbers for one phone and run Windows, so it can easily be used to double-up as a work and personal device.
Featuring a quad-core CPU running at 1.2GHz, the Lumia 640 offers responsive performance and great battery life. Its 8MP camera on the Lumia 640 and 13MP ZEISS optics on the Lumia 640 XL can be used to capture detail-rich photos even in low light. Both feature LED flash, a front-facing camera for Skype video calling, and Lumia Camera software right out of the box.
The Lumia 640 comes with Windows Phone 8.1 and the Lumia Denim update, but can be upgraded to run Windows 10, when it is available, offering even greater productivity benefits. The phones also come with a one-year subscription to Office 365 Personal, plus 1TB of OneDrive storage, and 60 free minutes of Skype Unlimited Worldwide calling per month.