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UDH (User Data Header)

User Data Header (UDH) is a binary structure which may be present at the start of a short message in an SMS. It does not contain any text, but rather specifies how the message should be processed. Basically, it's a part of the SMS which tells the receiving handset what type of message being sent. This is done to ensure correct SMS message delivery.

User Data Header (UDH) is a binary structure which may be present at the start of a short message in an SMS. It does not contain any text, but rather specifies how the message should be processed. Basically, it’s a part of the SMS which tells the receiving handset what type of message being sent. This is done to ensure correct SMS message delivery.

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