The Samsung i640v is a hefty, bulky slider phone - probably one of the biggest around - but underneath the slider there is a full QWERTY keyboard and two, yes TWO, batteries - so extra long battery life.

The Keyboard is small, but is still pretty good.  The phone also features touch buttons on the front - which don't offer the feeling of anything actually being clicked, which can sometimes feel a bit odd.

This smartphone has no touchscreen, so you're relying on the navigation touch buttons, but they can be somewhat of a nuisance sometimes.  As you would expect though, the phone comes with a 2 megapixel camera, but no Wi-Fi surprisingly.  The phone only offers Tri-Band not Quad-band also, which is a bit of a shame. 

As for battery, well obviously with two batteries in the phone, you can expect a long battery life - just make sure they are both charged up to the brim!

The Samsung i640v is a decent phone, but missing some key features that you would expect.  It's bulky, and maybe a bit on the large side, but the full QWERTY keyboard works well.