Dr.J,
Not true. There are very few specific things that a 'must have'.
What one must have is evidence appropriate to one's situation. If phone bills suit the purpose and you have them, great - use them. If they don't suit the purpose, or you don't have them, use other things.
Yodrak
QUOTE(Dr. J @ May 11 2006, 03:16 PM)

Just read that you have to have copies of phone bills to prove that you are communicating with your fiance. ...