I dont know if I came up with this idea or not, but Im damn sure the one to use it tho most, and the only one to have a 100% success rate when doing it.
What I do is, I hit up a girl in message, anywhere doesnt matter.
And this is how the convo usually goes.
Me-"

"
Her-"whats wrong?"
Me-"I dont know how to work this smart phone, do you have one?"
Her-"Yes, what is it you need help with"
Me-"I need to learn how to save contacts"
Her-"ahh, well you should be able to go to ur contact list and just tap add contact and then put in their number"
Me-"ohhh, ok"
Me-"well can you give me your number, and ima try to do it, and if you get a text from me that means I figured out how to do it."
And each time I done this the girl is literally like

:inlove:
My contact list is getting filled up quicc with baddies just off this method alone