how to "unlock" a verizon galaxy S3 for use with straight talk

[danoland]

Need help switching from Verizon to straight talk. I hear about a certain SIM card to get, but i don't know how to go about the process

 

[Titillating]

Call Verizon, purchase an unlock code. Their reps can also explain to you how to use it, if you are not familiar with the unlocking process.