Samsung Avila

Hello,

Since I couldn't find anything by googling it (99% of links were specs etc) and I've just recently bought this phone, I've been wondering if it's possible to do few things with it.

Completly removal of few things like:
-stuff that put my operator (ad's, widgets etc - very annoying)
-locked files on the phone
-default widgets, communication menu, etc

Is it possible to change the default broweser (by completly removing it) and put opera lite in place of it?

I'm sorry if the answers were on this forum, couldn't find any.