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Unstructured Supplementary Service Data

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Unstructured Supplementary Service Data is a standard for transmitting information over GSM signalling channels. It is mostly used as a method to query the available balance and other similar information in pre-paid GSM services, and also initiate [roaming] callback calls in some of them.

Example USSD codes: *101# *109*72348937857623#

After entering an USSD code on your GSM handset, the reply from the GSM operator is displayed within a few seconds.

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