it's called the "breathing light"
it's normal.. but until now i never bother to off it.. helps me find my phone in the dark room

hmm.. if i remember correctly u got wifi problem and now contacts problem..
can consider update firmware or hard reset ur phone and see if it works

you cannot open a .sis or .sisx file that has been bluetoothed over.
they were saying you can do it with FExplorer but i've never tried that or know the details

ovi is just an app.. once ur done with it.. it don't take up memory..
even if u dun upgrade, you can download ovi store app also
don't seem to take up a lot of memory to me