Not costly-- we have a rarely used Groupcall account with an annual quota of use them or lose them text messages, and it was a good excuse to test the system and and use up some of the annual quota. (We didn't have any snow days this year, for example.)
Since I had texted the fac/staff earlier in the day, and promised to text again when the issue was resolved, I bought in to doing two texts (including the all clear). We had a lot of faculty trying to access our services yesterday, and the first text message was to hold off and focus on something else. The second was to "come on back.."
Overall, it was an example of why we have Groupcall. We have text messaging as part of our on campus student information system, but it doesn't work when we're cut off from the Internet and our mail relays.