Have you tried reseating the SIM card? Or replacing it?
I'm most definitely NOT a VZW employee. If a post answered your question, please mark it as the answer.
Messaging is such a popular way to communicate. I don't want you having to power cycle to be able to message. Let's look into this. What changes were made to your device right before this concern began? Also, let's rule out the concern of any liquid or physical damage. Here is how to check: http://vz.to/1OscmM7.
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