Dial 611 on your Metro pcs cell phone to enter myMetro.
Select the third option on your screen labeled "myMetro Settings."
Select the third option on your screen labeled "Reset Voicemail PIN."
Enter your Metro PCS account password. If you can't remember your password, enter what you think it might be. If it is incorrect, you will be given the option to select a "forgot password" function, which will connect you to Metro PCS for assistance.
Verify you would like to reset your voice mail by selecting "Yes, Reset PIN." A new PIN will appear on the screen.
Use this PIN to log into your voice mail. You will be asked to choose a new password again.
option 2 will be calling metro pcs customer care @888-863-8768, speak to a representative and they will set it back to 9999.