The web-based Verizon Messages server (https://web.vma.vzw.com/vma/web2/Message.do) appears to be down -- it reports a generic server error:
Server Error
This server has encountered an internal error which prevents it from fulfilling your request. The most likely cause is a misconfiguration. Please ask the administrator to look for messages in the server's error log.
Is there any ETA as to when it might be restored?