A better word in this case would be "miscommunication". Since the text never made it to you, it was technically a communication problem. A miscommunication. This word isn't only used in such a literal sense. You could also use if if the text came through, but it was unreadable or something. With a "misunderstanding", you have communicated fine (texted, talked, emailed, etc.) but the meaning is confusing or you two interpret what was said in a different way. Let's consider it a miscommunication. Let's just say it was a miscommunication. etc. Hope that helps.