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

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

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

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

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

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

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

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

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

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

SMS message: </p>

<ul>

<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>

<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>

<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>

<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>

</ul>

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

<ul>

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

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

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

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

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

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

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

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

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

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

</ul>

</conbody></concept>