Network Checker IMEI: There are two mobile technologies used in 2G and 3G networks, and they are GSM (Global System for Mobiles) and CDMA (Code Division Multiple Access). The newer technology uses LTE so GSM and CDMA don’t matter but they are still around for backward compatibility reasons. In the United States, AT&T and T-Mobile … Continue reading Network Checker IMEI, Mobile Phone & Network Check Compatibility, Dual Sim Check, Check GSM/ CDMA