If you missed the latest One Call Message you can do the following to hear the message

From any touch-tone phone, dial 877-698-3261.

Listen to the auto-responder, when prompted with the statement “To hear your Group’s latest message,” press 1.

     Notes:    

Image If prompted, enter the phone number One Call Now normally calls.For example, if the member usually receives
      the calls on their home number, they would press 1, and then enter the area code and home phone number.

Image If members call from the phone number that received the message, One Call Now uses the caller ID to
      determine which group sent the last message and then, replays the message.

Image If members call from a number other than the one in Contacts, they must enter the phone number
      listed in the Contacts file to hear the message.