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    10 <!DOCTYPE concept

    11   PUBLIC "-//OASIS//DTD DITA Concept//EN" "concept.dtd">

    12 <concept id="GUID-0BC9A9A1-DB99-5095-8390-E1C1B04D0080" xml:lang="en"><title>Introduction</title><prolog><metadata><keywords/></metadata></prolog><conbody>

    13 <p>When you send an SMS message all of the characters in the message are encoded

    14 as 7-bit GSM code or Unicode Character Set-2 (UCS-2). The message is then

    15 sent in one or more Protocol Data Units (PDU). A PDU contains information

    16 about the control, address and data to deliver an SMS message. </p>

    17 <p>The 7-bit encoding cannot represent all characters. UCS-2 includes all

    18 of the characters within the Basic Multilingual Plane, but it reduces the

    19 number of characters in one PDU from 160 to 70. Users are often charged by

    20 the PDU. A message encoded using UCS-2 can be more expensive than the one

    21 encoded using 7-bit GSM. There are four types of SMS encodings to encode an

    22 SMS message: </p>

    23 <ul>

    24 <li id="GUID-B548C03F-BCCF-58EC-8043-844372B5A91E"><p><xref href="GUID-FE94596E-B5BB-51FE-BE38-069840323915.dita#GUID-FE94596E-B5BB-51FE-BE38-069840323915/GUID-F7D1E6C8-9605-57FA-9788-AF7FC72BD94C">7-bit GSM encoding</xref>  </p> </li>

    25 <li id="GUID-C486071F-F184-5DD8-BA4A-51444548DD38"><p><xref href="GUID-FE94596E-B5BB-51FE-BE38-069840323915.dita#GUID-FE94596E-B5BB-51FE-BE38-069840323915/GUID-918FF2E3-B9F4-5C61-8DBA-F9143DB16460">Lossy 7-bit encoding</xref>  </p> </li>

    26 <li id="GUID-EE33620C-7D69-5BDE-8CBB-ADE2D0CE6BAD"><p><xref href="GUID-FE94596E-B5BB-51FE-BE38-069840323915.dita#GUID-FE94596E-B5BB-51FE-BE38-069840323915/GUID-D2F0E6BE-932E-545D-A0C8-39017E3D67B4">16-bit Unicode encoding</xref>  </p> </li>

    27 <li id="GUID-1B9705DF-2187-5F43-9615-C43D58417A3C"><p><xref href="GUID-FE94596E-B5BB-51FE-BE38-069840323915.dita#GUID-FE94596E-B5BB-51FE-BE38-069840323915/GUID-93B3DDF2-8EB1-5853-9DFD-3ABF42ADCB40">National language encoding.</xref>  </p> </li>

    28 </ul>

    29 <p>The following character converters are used in the SMS encodings: </p>

    30 <ul>

    31 <li id="GUID-822C740E-9A27-5D82-BD68-B7094113B535"><p><xref href="GUID-0CD18555-07EB-545D-9D47-D69A6BE6D2C8.dita">Standard

    32 SMS Converter</xref>  </p> </li>

    33 <li id="GUID-E0633334-73B7-5A72-835B-080E78655703"><p><xref href="GUID-B1254526-3C72-59E7-88C0-667FC051379F.dita">Extended

    34 SMS Converter</xref>  </p> </li>

    35 <li id="GUID-87BA0ABD-13E7-58B8-8335-7BCE105AD68C"><p><xref href="GUID-738FADA9-E26F-53F1-A6D6-2E82019DDA1F.dita">Turkish

    36 National Language Support</xref>. </p> </li>

    37 <li><p><xref href="GUID-C524C3E8-D151-5AB2-8791-1342C297FFBB.dita">Portuguese National

    38 Language Support</xref></p></li>

    39 <li><p><xref href="GUID-4A9053C2-80ED-5FB7-B07D-E1DC5D965213.dita">Spanish National

    40 Language Support</xref></p></li>

    41 </ul>

    42 </conbody></concept>