Hello from Europe,
I have a simple trick. After talking some amazing chick things with them: like their sign , my sign , social life... I just tell them to call me with a private number. #31#+my phone number, and if they think I am not a psycho to give me their number after that. Or I am telling them at the end of the converation "So , I am not a psyhco, am I?! Just give me a SMS with your number".