yo bro, normal 3G video call only available on Samsung, other android phone dont have.
you can only do internet/wifi video call via apps like Tango, Skype ETC.
ya, actually for now our phone is very stable and nice.
preferable update brings new launchers, camera apps (lesser of heavy image compression).  

Just use Google hangout,

Every android devices sure got one as it come in as stock and cannot be uninstalled, it also work with pc (by using browser), gmail, and IOS.

so far the only ones i know are:

standard (locked/unlocked BL , stock/CM10.x rom)
1. force reboot if phone hang = power button + volume up
2. screenshot = power button + volume down
3. in case of overheating = a tip is to open all ports to let the hot air flow out faster
4. [for stock rom only]activate "myxperia" service under settings (for lost phone. make sure GPS/data/wifi is enabled)
5. [for cm10.x rom]settings -> device administrator -> tick that device admin thing (functions the same but less features compared to myxperia)

rooted
1. xposed mods (first page got link)

others:
1. sync your contact with your gmail acc
2. sync your notes with google keep

press the word and hold for 1-2secs and something will pop out..

for chrome is double tap, then it will auto highlight the whole url and u can click on the copy icon