Operative system

With buttons?

My mom had one and I borrowed it and I flipped it so hard that the top part flew off and hit my sister

I'd buy it.

They sort of did already:
http://en.m.wikipedia.org/wiki/Droid_Razr
At launch, it was the thinnest, lightest and most powerful smartphone on the market.

I loved this kind of phone. After a heated argument, you could flip it like a drama queen

make it bigger like 4-5 inch screen both halves having their own respective screens. able to turn sideways and whatnot but have the bottom part used mainly for the keyboard top app screen

It would totally suck