SMS feature doesn't work after business hours?

I run a business and handle some admin work after business hours. I am trying to set up a new profile and the site requires text verification. I just realized, after never receiving the texts from the company, and not receiving my own test texts, that SMS doesn't work beyond the set phone hours. What is that about? AND there are no separate features to manage SMS apart from other phone features. This service is not as dynamic as advertised.