The Microsoft Lumia 640 isn't all that remarkable on its own. It's another Windows Phone device, made by the people who up until this past year were known as Nokia. Now it comes from Microsoft, and it's ready to roll for a cool $130 USD. That's a good value for what the device presents. But with today's Elop exit and news of Microsoft's reshuffling, is it a good time to be buying in to Microsoft's phone ecosystem? Or is this the company's last gasp before throwing in the towel?