To access your ZIP SIM voicemail, dial 805-637-7059 on your phone’s keypad, then press call or send. Once you’re connected to your voice mailbox, simply follow the prompts to manage your messages or change your voicemail settings.
Note: You must have a ZIP SIM with a plan that includes voicemail in your device for this method to work. You must also be in the States.
You can access your voicemail on a different phone by calling 805-637-7243 (1-805-MESSAGE), then entering your ZIP SIM phone number. This method requires a PIN number. If you haven't already setup a PIN, the default PIN is the last 4 digits of your SIM Card number.