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How does GSM Gateway work?

GSM Gateway - Global System of Mobile Communication, had quietly changed the entire world from ordinary phone calls to international phone calls

GSM offers users wider international roaming capabilities than other US network technologies and can enable a cell phone to be a “world phone." What's more, things like easily swapping phones and using data while on a call is supported with GSM networks but not CDMA.

GSM network operators have roaming agreements with foreign operators, users can often continue to use their mobile phones when they travel to other countries. Sim card (Subscriber Identity Module) holding home network access configurations may be switched to those will metered local access, significantly reducing roaming costs while experiencing no reductions in service.

GSM provides standard features like phone call encryption, data networking, caller ID, call forwarding, call waiting, SMS, and conferencing