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This refers to Unstructured Supplementary Service Data. This is a protocol used by GSM cellular phone technology to communicate with the service provider's administration computers. This allows greater functionality than just the basic phone call. It can be used for location-based content services, Wireless Access Protocol (WAP) browsing, prepaid services, and more. It can also be involved in setting up/configuring the phone for use on the service provider's network. You can read more about it on Wikipedia:Unstructured Supplementary Service Data.

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8y ago

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