Historical clue formulations

• Phone number? — 2023-04-15
• Annoying thing to hear in a movie theater — 2020-11-20
• A few notes that require answering? — 2019-08-29
• Notes to pick up on? — 2011-08-21
• Bars for a cell? — 2009-05-16
• Cell phone selection — 2006-11-10