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Concatenated short message service (concatenated SMS) is a series of multiple messages joined to form and communicate continuous SMS messages, providing convenience to modern mobile phone users.
One SMS message accommodates 160 characters, so early SMS-capable mobile phone users had to send successive individual messages to deliver longer messages. Concatenated SMS resolves this inconvenience.
Concatenated short message service is also known as PDU mode SMS.
A concatenated SMS accommodates up to 255 separate SMS messages. Concatenating (or joining) separate text messages is invisible to sending and receiving mobile users, who enter and/or read one long continuous message within a user interface.
Behind the scenes, eight-character SMS parts are used within the user data header information. As a result, only 152 characters of each SMS message part are accommodated. Because there are multiple SMS messages in a PDU mode SMS, service providers normally charge users for each SMS part within the entire concatenated SMS.