Question
A Global System for Mobile Communications (GSM) protocol
that is used to send text messages is known as USSD, what is the U in it?Solution
USSD stands for Unstructured Supplementary Service Data. It is a communication protocol used by Global System for Mobile (GSM) cellular phones to communicate or send a text message from a mobile phone to an application hosted by the mobile operator just like SMS (Short Message Service). A message in USSD can be up to 182 characters long.
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