I'm not aware of you being able to choose to not have a password. I'm surprised you even had a voicemail setup withojt a password.

Both of our phones did not require a password, now suddenly one does.  It’s weird

You can reset your password by accessing your voicemail, then entering any random 4 digits when asked to key in your password. This will give you the option to request a password reset. 

Step-by-step instructions

1. From your handset: Dial 1 + your 10-digit phone number + Send or Long press 1.
2. When prompted, enter any password.
3. After 1 failed attempt, you will be prompted with "This is not the correct password. Please try again, or to reset your password press the STAR (*)
4. Press 1 to have a temporary password sent by SMS to your phone.
5. A temporary password will be sent to your phone. Please access your mailbox again using this password.
6. The SMS will show as follows "Your temporary password is XXXX"
7. To reset your password, please hang up and call into your voicemail again from your mobile phone, enter the temporary password that was sent via SMS and then follow prompts to enter your new password.

Thank you for tying to assist.  My problem is that I don’t want to have ANY  password to access voicemail.  For some reason my phone now requires me to have a password.

 @GONGSHOW 

You should be able to find in the Voicemail menu the option to bypass the password when calling the Voicemail from your Koodo phone number.

Please check this article https://www.koodomobile.com/en/help/voicemail?srsltid=AfmBOoqOxwPp3qbGDNFOfOzsBt5XIv7nbSnEJC7uhwu-9u6Jhm849hDJ  - > Everything you need to know about your Voicemail menu.