My T has encouraged phone calls, email, and text. She knows I won't abuse it, and she just wants me to reach out to her in whatever way I feel most comfortable. She has used all 3 methods for contacting me regarding scheduling changes. When my T asks me to send her a quick update, I text. If I need to process something or just tell her something, but don't really require a ton of feedback, then I email. If I'm really struggling and need feedback or just to talk to T, then I call.