Consider me old fashioned (probably just old) but I find really annoying that some of the providers and at least one agency insist in communicating with text messages. I don't have time to go back an forth with hundreds of text messages to schedule an appointment (I have a life).
In addition, there is the concern of leaving a record of your communication at the phone company and the fact that it may not be the person you are intending to communicate (what if LE busts a provider or an agency owner and confiscates his/her phone or what if the jealous boyfriend that didn't know that he sweetie was providing decides to grab the phone).
Personally, I don't think that anything beats the human touch of someone answering the phone. After a couple of negative experiences, I don't think I'll ever try to schedule again something with someone who prepares text as a way of communication.