But - -
Would you even expect to be receiving a text of any sort unless you were due to start a shift within the next couple/few hours?
As you know, traditionally most staffing decisions are made within an hour or two of the shift starting. In theory, couldn't a person just check her/his phone before getting in the shower to make sure s/he hasn't been "called off"? Are they really saying that they plan to possibly send you a random text message "mandating" you (to come in) when you're not on call? [I would tend to think that's NOT the case....I know anything's possible, but this sounds a LITTLE bit like hype]
Now I'm not saying any of this is "right" as far as the practice goes...unless having a cell phone with a texting plan that includes YOU paying for receiving text messages from your employer and also ALWAYS being on-call is part of an agreed-upon condition of your employment (and we know that's not the case). I'm just saying hopefully people are being sensible and not over-reacting. First thing to do is read the policy for yourself. Were it me, I would not go along with the "hype", but sit down and read the policy and respond in a calm and rational manner personally to your direct supervisor.
Possibly most importantly - - are you an "at will" employee? If so, my understanding is that they have a lot of leeway to change their policies as they see fit, within applicable laws, of course.
I hope it's not as bad as it seems/sounds!!
I'd be interested to hear what you find out.