People are freaking out about mystery texts sent from their phones

No, this is not a late Halloween story. 

People across the internet are sharing creepily similar stories of mysterious text messages being sent from their phones to friends, parents, and partners. The messages show no record of being sent from the smartphones in question, but they are very much being received by confused people on the other end. 

As you might expect, everyone involved is both confused and weirded out.