I get these random texts myself. In the early days I took it all on face value and thought it quite respectful that a provider would keep me in mind and update me when contact numbers were changed.
Now, as a seasoned punter, I can tell you to be very careful. Why?......because it usually turns out that the provider has a new pimp/madam and it's him/her that is sending the texts to entice you in for business.
It could also be an indication of a B&S where gang girls leech off each others phones.
Be careful guys!