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U:

UDH
UMTS
Unicode
Universal services
USSD
 

UDH
UDH (User Data Header) allows a user to include data in a special format by indicating the type of the SMS itself (such as concatenated and binary SMS). It is a part of the SMS which is not visible to the user, but which provides a specific message to the handset about the type of message received in order for the message to be correctly received by the handset. In case the message is concatenated, the user header will inform the handset to stitch together all necessary parts.