According to the CBS website:
CALL THE BIG BROTHER HOUSE
The HGs could use some advice and this is your chance to give it to them! Call the number below and give them your two cents — from wardrobe to hygiene tips, your advice can have an impact, make them laugh, or just get under their skin. So be creative and your message could be played in the house and even air as part of the show!
Leave your message anytime until August 2, 2009 at 11:59pm PT.
Tune in to every episode to find out when your messages might be played to the houseguests!