I've manually set up several mobile numbers as subscribers and created a post, but apparently none have received a text message. I also tried using the manual text message send feature, saw it added to the queue, and then shortly thereafter disappearing from the queue, presumably after being sent. Still, no evidence that any of the subscribed phone numbers have received it.
So how to troubleshoot this? The site happens to be hosted by GoDaddy. Are there some settings I need to check on in my hosting account there?