GSM Worldwide

GSM is an extremely popular wireless network, serving over 1 billion people worldwide. The GSM network is becoming more popular in the United States, where CDMA network service providers previously reigned. GSM is clearly the more popular network in foreign markets. Due to the compatibility between all unlocked GSM phones and all unlocked SIM cards, GSM is the clear choice for frequent or even one-time travelers and other people for whom it is advisable to use different cellular services at different times.