what is gsm unlocked
August 13, 2012 11:20:48 PM. Unlocked GSM phone means that it wouldn't be locked into a specific carrier network. On the upside it means freedom to choose your own GSM carrier that suits your needs (and wallet) best. On the down side several carrier-specific features may not be available. If you lived in US make sure that the unlocked phone is compatible with US GSM frequencies.