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What is a GSM Gateway SIM Card and How Does It Work? What is a GSM Gateway SIM Card? Specialized SIM cards called GSM Gateway SIM cards are meant to be used in GSM Gateways, which are devices that route calls from regular landlines to mobile networks as well as the other way around. This SIM card is meant for use in mass or automated systems, such as call centers, VoIP networks, and advertisements. It functions identically to the one in your mobile phone. Regular SIM cards typically function in individual phones; on the other hand, GSM Gateway SIM cards are intended for applications with heavy usage and can manage high call, text, or data traffic volumes. These SIM cards frequently come...

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