I have an E71, and am greatly enjoying it. My question concerns operating system (and any other) updates.

I acquired the phone in late November 2008, and have not had the need to add any applications - my needs are met by the apps that came with the phone.

Going with the "why disturb something that is working" philosophy, am I missing out on any radically important functionality or new features by not upgrading the OS?

I'm not a techno-phobe and have no problem updating my work or personal computer systems, but this is my first smartphone, so I am a little inexperienced in the need-to-upgrade field. The phone is a US-spec E71-2, acquired factory-unlocked.

Thanks for any advice/responses.