This is a truly unlocked phone so I can use it on any network anytime. I even switch it out and use 2 diff sims sometimes. It is not a 5g phone but I'm not even sure straight talk has 5g service anyway. I'm not sure about that I worked for straight talk in 2016 so its been a bit. I work at sprint and they are the hardest of all to get on an unlocked and this one works for them as well.