What phones can be used on Straight Talk

[MamaTigra]

I'm already with Straight Talk but I want a better phone. I'm curious if I buy an unlocked phone say a Galaxy if I will be able to use the phone on Straight talk? I'm getting confused as to whether unlocked means I can use it or not?

 

[inzone]

If you buy an unlocked phone then you can use it on straight talk. A locked phone means it's locked to a specific service provider.