Don’t worry - it’s completely legal to do. If you’re looking to switch providers or just hoping to add some value when selling your phone, unlocking it is a must. Unlocking your phone means that you can switch carriers if you’re dissatisfied with the service, move to a different region, are traveling, or want to keep your old handset when you change networks. Don’t forget about third-party lock breakers.How to unlock your prepaid or fully paid phone.iPhone error message? Here’s what to do.How to unlock a Metro by T-Mobile phone.