Microsoft Lumia 640 joins AT&T's prepaid GoPhone lineup, will set you back $79.99

Earlier today, the carrier quietly added another smartphone to the GoPhone series, the $79.99 Microsoft Lumia 640. The new addition comes after, just a couple of days ago, AT&T added the Asus Zenfone 2E to its affordable GoPhone prepaid lineup.

Previously available through some retailers as well as T-Mobile and its pre-paid subsidiary (MetroPCS), the Microsoft Lumia 640 is one of the most popular Windows Phone 8.1 smartphones currently around, a feat that it has achieved through a balance of low pricing and decent hardware.

At, $79.99, the Lumia 640 offers a good value if you're in the market for a smartphone that can do the basics, but not much more than that. The handset comes with 5-inch IPS display running a resolution of 720 by 1280 pixels at a PPI of 294, a 1.2GHz quad-core Snapdragon 400 chipset paired with 1GB of RAM, and 8GB of MicroSD-expandable integrated storage space.