Historical clue formulations

• "Hold on, I'll be right with you" — 2025-08-02
• "Hold on" — 2009-08-07
• Old company telephone line — 2009-05-23
• Operator's line — 2009-03-28
• Telephone line — 2005-06-11
• Line of business — 2005-02-11
• Phone line? — 2003-01-10