When did ASKING for HER NUMBER become the FIRST thing to do?

When did ASKING for HER NUMBER become the FIRST thing to do?

When I was younger and dating, a guy would ask the girl out and then if she said yes, they would exchange numbers.

Today, a guy asks a girl he's interested in for her number and if she gives it to him, he says he will call her... often a few days later to arrange a date.

When did asking for her number become the first thing to do?

When did ASKING for HER NUMBER become the FIRST thing to do?
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