This video make some speaker. i can say the speaker pretty loud. 

G2 gooding but it's 5.2", way way too big for my palm, as my palm not getting bigger, phones getting bigger , sure my skinny pants pecah.   

N5 is 5", which is the largest screen i can go. >5" hell NO!

nowadays, on screen keyboard like swiftkey, offerred single hand operation mode for those BIG screen device, which is smaller keyboard that you can put at left or right side.
after not much improvement room anymore in smartphone can go in future, I believe every smartphone vendor will start jump to smartwatch bandwagon. there is already couple of smartwatch in the market like galaxy gear, pebble, Sony SW2, neptune, omate, etc.... will be great if google also can bring the concept nexus watch to the market.

Don't think it is necessary, is it?

with the + sign or not, they work just fine...

try editing the number in the "people" app. i have those + in front of all the numbers. not sure if they are necessary but i still did it anyway.