Better way to set up OTC: In-person, phone call or text?

When you set up OTC with a dancer, any preferred way you go about it: in-person, by phone or by text? I've had my hits and misses with each method. I much prefer to do it in-person for a more personal touch but most of the time, circumstances (dancers not being at the club regularly, etc.) don't allow it. Any way or method that is preferred or recommended would be helpful.