To overcome the limitation of 160 characters on a single SMS, the message is split into several SMS by the sending device and recombined at the receiving end.
One way of sending concatenated SMS (CSMS) is to split the message into 153 7-bit character parts, and sending each part with a User Data Header (UDH) added onto the beginning.
It is possible to use a 16-bit CSMS reference number in order to reduce the probability that two different concatenated messages are sent with identical reference numbers to a receiver.
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