A number is momentum, and momentum dies fast. The biggest mistake is sitting on it for days while the memory of meeting you fades.
Text the same day. Your first message has two jobs: remind them who you are with a callback to how you met, and be easy to reply to.
You are still fresh in their mind. A same-day text lands while the positive impression is alive and shows you do not play timing games.
Reference the moment you met or the joke you shared. A callback instantly separates you from every other number in their phone.
A light question or playful claim gives them a doorway. Statements with no hook make even interested people unsure how to respond.
Same day, ideally within a few hours. Waiting days does not build mystery, it builds distance and makes the first text feel colder.
A callback to how you met plus one light hook. Identify yourself, make them smile, and give them an easy way to reply.
Identify yourself, yes, but attach a moment to it. Hey plus your name is forgettable. Hey plus the croissant fight is a conversation.