How do i retrieve voicemail from my samsung phone

Some variation on this with each wireless service provider (I have had 4 in the past 9 yrs).
Dial your own phone number from your cellphone.
when asked to enter your security code - enter 0000
then - you will be asked to change your security code....
Once done, you will now just dial your number from your phone, then enter your new security code.

That should do it (for Verizon, Alltell, AT&T, etc.)