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If you don't ask for her number soon enough, other guys will. Remember, the goal when using any dating app is to meet her in real life, not. Want to ask a girl for her number online, but don't know how (or when!) to do it In our experience, on a dating site like Match.com or POF, it's usually after she's sent you 2 to 4 messages. It will be a handful more if you're on an app like Tinder. You can get a Burner number for Tinder (or whichever dating app You're inclined to ask for their phone number or Instagram account just to.