Update carrier settings?

[mdwsta4]

Received a message when plugging my phone in asking me to update carrier settings. what does that mean/do?

second question, I don't recall noticing the Identifier UDID. what is this? it's like 50 letters/numbers. itunes used to show my carrier or phone number or something.

 

[Tallest Skil]

1. MY STARS, how do you people charge your phones?!
2. It isn't important, really, unless you're a developer testing 3.0.

 

[mdwsta4]

i charge my phone on a dock, not through my computer.