I think the bottom line here is discretion. That's the axis the hobby world spins on. For the most part, anyhow.
I understand why the single guys don't mind getting these sort of texts, but most gentlemen in the hobby are not single. So for the sake of others, it shouldn't be done. There are a few very basic, tried-and-true set of unspoken rules in this game of ours, and they exist for a reason. Unless we are told otherwise, as the case sometimes may be with those who don't mind, a provider should never call out of the blue. Send a friggin' email for chryssake. Times are not THAT bad.
If you're okay with using your personal cell phone to make and receive hobby related calls, and you are in a LTR, more power to ya. I like living on the edge sometimes, too.
The rest of you should invest $20 on a TracFone, or get really fancy and spend $30 on an AT&T Go-Phone. They are for folks with bad credit, so there's no phone bill, and no paper trail. Only turn it on when it's safe to talk, or if you're expecting it to ring. Problem solved.
Thank you for spending Hobby 101 with me this evening. Tomorrow's lesson: Is She Real? How To Identify Bullshit On Backpage.