How can i delete the messages on my phone. I need to disable it to send back to the replacement warranty place. they told me i had to disable the phone. the type of phone i have is a Samsung Galaxy Centura android powered 3.5 touchscreen, android 4.0,

How can I delete my voice mail messages on my Samsung Galaxy Centura cause i need to send it into warranty replacement, and they say I need to disable my phone. The recording just says its full and won't let me listen to any messages. When I call my voicemail it asks me to enter my password, but the keyboard won't come up.

Is there a way I can call from another phone and get my messages and erase them, before sending the phone off to warranty.I don't want my personal info tampered with.