[venious]

I'm curious, for those that have the 640 now, if each side/edge is still angled like the 635. The edges on my 635 have caused me to to fumble for my phone a lot, because as you apply pressure to the edges it causes the phone to rotate and slide away from your fingers. Not a great design, unless you want people to drop and replace their phones.

[venious]

I think this review answers it, and I like it.

The Microsoft Lumia 640 Review

One key difference between the Lumia 640 and some of Microsoft’s other Lumia devices is that it has flat sides and rounded corners. This contrasts with the traditional appearance of Lumia devices, which are flat on the top and bottom, but rounded on the left and right sides. The shape of those edges also meant that there was no way to have rounded corners even though the corners of the black face plate were rounded, which I felt created a unique appearance that made Lumia devices more distinct. The more standard flat edges and rounded corners of the Lumia 640 just aren’t as unique, and I wish it was more like a traditional Lumia phone.

[Scooooter]

I don't see where this article addresses the angles. I hate the angled sides of the 635. When I put a case/skin on, it helped with the grip, and the slipperiness of the angled sides are a lesser problem now.