The term “unlocked phone” has become very popular as online phone sales increase. At this point, “unlocked” has become a trendy term that people search for when they buy cellphones online. Here’s what you should know before buying an unlocked phone. Types of Unlocked Phones GSM-Unlocked – GSM-unlocked phones are the most common type of “unlocked” devices. These devices are unlocked only for GSM networks (In the US, the main GSM devices that can be, or already are GSM-unlocked are T-Mobile and AT&T). You can use that device on any GSM network, but not other network types. A GSM-unlocked phone will not be compatible with CDMA or PCS networks. One benefit to GSM-unlocked devices is they will work in other countries where GSM networks are available. […]