I probably won't be getting the job because of this, but a potential employer texted me a day after emailing me and I set a boundary. See, I had already responded to the email, and the text said exactly the same thing, asking for times I would be able to interview. So I said:
“Hello, I responded to your message already. I do not accept text messages from potential or current employers on my personal phone. Thank you.”
Short, sweet, to the point. Implication: don't spam me. Boundary: Don't text me.
I have this boundary because none of anybody's business. But it's my personal phone and I don't want employers hogging my communications, especially because it's hard to ignore texts when they come outside of business hours and you think it might be a friend or a family member.
Instead of taking this gracefully, the employer scolded me for including my personal number (which is my only number) on my resume at all.
I said, “You are free to call me on this number. Please do not text it again.”
If they don't respect such a tiny request, they'll never respect you as an employee. To these people, boundaries are just attitude problems or mistakes.
Don't let them push it, even this early in the process, and don't let them scold you for it, either.