Review: Microsoft Lumia 640 XL for AT&T
The Lumia 640 XL is, by and large, a great phone. It's attractive, well-made, and performs well for a $250 handset. I wish the screen had more pixels and I wish call quality was a bit better, but these aren't deal-breakers. Windows Phone runs perfectly on the 640 XL, and Microsoft's core apps are quite good if you need to pair the 640 XL with your work environment. The camera does a great job, (as is often the case on Lumia handsets.)
If you're in the market for a Windows phablet, the Lumia 640 XL is "extra likeable" and I recommend it. If you want something a bit more compact, the 640, available from Cricket or GoPhone, might be a better option.