The easiest and least expensive way to unlock a Samsung cell phone is to request a free unlock code from the cell phone provider associated with the phone. If this is not possible, go to a business that offers phone unlocking services for a fee.
Cell phone providers are legally required to provide free unlock codes for cell phones attached to their services. While unlocking cell phones in any manner was illegal for several years, legal decisions and internal industry policy changes in 2014 lead to this requirement. There are some restrictions to these policies that vary from carrier to carrier. For example, most carriers require that the owner of a contract phone satisfy all obligations of the associated contract, or that the user of a prepaid phone complete a certain number of months of service with the carrier, before the carrier provides an unlock code for a phone. Some carriers also sell phones that are already unlocked, such as most Samsung 4G LTE phones sold through Verizon Wireless.
If it is necessary to unlock a Samsung phone before the carrier normally allows it, many websites and local businesses offer unlocking services. However, unlocking a phone through these services may be a breach of service contracts with a cell phone provider and could expose those who prematurely unlock phones to fees and penalties.