| GCS |
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Global Cellular Service, which permits rapid roaming with many partners through one single agreement and by means of an IRP |
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| GPRS |
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General Package Radio Service |
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| GRX |
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GPRS Roaming eXchange, serving point of GPRS Roaming Network. Provides for routing, interconnecting and some additional services, such as DNS |
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| GSM |
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Global System for Mobile |
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| GSMA |
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GSM Association |
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| GT |
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Global Title |
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| GTT |
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Global Title Translation |
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| HLR |
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Home Location Register |
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| HPMN |
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Home Public Mobile Network |
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| HUR |
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High Usage Report |
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| iDEN |
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integrated Digital Enhanced Network |
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| IMF |
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International Monetary Fund |
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| IMSI |
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International Mobile Subscriber Identity |
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| IOT |
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Inter Operator Tariff |
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| IP |
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Internet Protocol |
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| IRA |
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International Roaming Agreement |
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| IREG |
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International Roaming Expert Group (GSM Association) |
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| IRP |
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The International Roaming Platform behind GCS, where the SCCP and MAP signalling policing between the roaming partners is performed |
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| ISDN |
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Integrated Services Digital Network |
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| ISP |
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Internet Service Provider |
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| ISPC |
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International Signalling Point Code |
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| ISUP |
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ISDN User Part |
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| ITU |
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International Telecommunication Union |
