Question

What is meant by US SD?

Answer 1

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$\huge\star\underline\mathbb\orange{USSD}$

Unstructured Supplementary Service Data

Answer 2

Answer:

USSD  (Unstructured Supplementary Service Data) is a Global System for Mobile(GSM) communication technology that is used to send text between a mobile phone and an application program in the network. Applications may include prepaid roaming or mobile chatting.

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