Phone number entries in your address book

When making an entry of a telephone number into your phonebook (PDA, Phone), what format do you prefer?

Is there a universal standard?

(555)111-2222
555.111.2222
555-111-2222

I don't care for the parentheses myself. Most of my entries are #3, although #2 has more of a modern look to it.

And what about the country code? Does that complicate things a bit?