Sometimes my @daily reminders don't come as SMS texts

I've set some reminders to repeat daily, i.e. Remember to wake up at 5am @daily.

I've been consistently getting email reminders for these. They show up on my daily agenda thingy and on my schedule on the website. But I don't always get SMS reminders (which are more useful to me). It's not even that they're late, they just don't come at all. But I do get SMS reminders for other things. What's the deal?
 
silly I’m not able to rely completely on Sandy for recurring daily reminders!
Inappropriate?
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