AT&T is currently offering a good deal on one of the best budget-friendly Windows Phones of 2015. Right now, AT&T GoPhone customers can get the Lumia 640 for just $19.99 at activation with the purchase of $45 or more of airtime.

The Lumia 640 originally debuted earlier this year, alongside its big brother the 640 XL. The Lumia 640 features a 5-inch, 720p display, along with 1GB of RAM and 8GB of internal storage. Storage can be expanded with a microSD card. The 640 also has a 8MP rear camera, along with a 1MP front-facing camera.

The Lumia 640 will be available at this discounted price for GoPhone customers at AT&T stores throughout the holidays.

Read the Windows Central review of the Lumia 640