There's always been debate around this topic.
I'm in my early 40s. When I was in the last 2 years of high school and college (1999-2005), communication was almost all voice phone calls and voicemail machines. After getting a woman's number from an in-person approach, the common guidance was wait 3-7 days to call her if you didn't set the date with her before getting her number then. In the 1990s, Doc Love made a name for himself in "The System" by promoting the one week between contact rule.
@EyeBRollin made a post a few years ago updating the Doc Love post to the technology of the current era. That post is in his signature.
The question of "how soon do you contact her again?" depends on many things. Did you meet her from an in-person approach, a swipe app, or a social media DM? Have you had a first or second date with her yet? Have you had sex with her yet? We would need a more pointed question.
With newer technology, there's a need to consider the age of the woman. If she's a late Gen X (1975-1980 birth), she is likely more open to voice calls. Earlier Millennials (1981-1986 births) are sort of borderline on phone use. Some may be open to voice calls but this is where people start to prefer texting.
@BaronOfHair is correct that the fundamental of 'Don't Be Desperate' hasn't changed since the movie Swingers in the mid-1990s.
