You can't buy. Ask the shop. They have. If they don't have they will borrow from other shop.
Mine was original. Got 3rd party also. Some rare phones don't have original battery. They quite honest, if you know the right questions to ask. If not original they will tell you one.
I read 10. But this is not front facing, so I only enrol the left and right index finger.
It's not Beta, it's from their official site, release version actually. Really damn good. Last time I had to do those backup to internal SD thing, now it seamlessly does everything nice!
http://www.whatsapp.com/android/
I went to Apps. May not be the best but I keep going to them it's OK.
http://www.shops.sg/shop/apps-electronics-sim-lim-square