Since Vault12, Inc. does not have access to any information about your Vault or your Guardians, you will have to remember who your Guardians are, and directly contact them. Fortunately, this is the only secret information you have to keep in mind, and who your most trusted people are should be simple, highly-memorable knowledge for any human in any situation. Contact with your Guardians could be arranged via voice or video call, text messenger, or in person - any common and preferred method that will allow your Guardian to validate that you are in fact who you say you are.