Hey there, Edwin1172! We're sorry to hear that you've been misinformed. When you activate an unlocked phone with us, it remains unlocked. We are actually unable to lock the phones that are originally unlocked. Some systems may show the phone as Boost Mobile if you are currently using it with us (attached to your account), but once the phone is not on your account there shouldn't be any issues activating with another carrier (assuming it is compatible with them).
When it comes to the phones that we sell on our website and our stores, those are locked, as we do not sell unlocked phones.