My Message app no longer updates/receives new texts. When I log into vtext.com, that no longer updates/receives new texts either. I can send texts from these two services, but cannot receive them on either of these. My phone still works fine. Any ideas?

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My Message+  app no longer updates/receives new texts. When I log into vtext.com, that no longer updates/receives new texts either. I can send texts from these two services, but cannot receive them on either of these. My phone still works fine. Any ideas? Thank you.