There are a few ways to determine if your phone is unlocked. One way is to insert another carrier's SIM card into your phone and see if it registers on that network. If it does, then your phone is unlocked. Another way is to check your phone's settings. If you see an option that says "SIM card lock" or "network lock," then your phone is locked. If you don't see either of those options, then your phone is most likely unlocked.