SMS Encoding & Overhead

Analyze SMS segmentation, encoding efficiency (GSM-7, UCS-2), and User Data Header (UDH) impact.

Enter message text to calculate segments and overhead.

Technical_Authority

Standard SMS messages are limited to 140 bytes of user data. With GSM 7-bit encoding, this allows for 160 characters. For concatenated messages, a 6-byte UDH is required, reducing available space per segment.

•3GPP TS 23.038: Alphabets and language-specific information

•3GPP TS 23.040: Technical realization of SMS

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SMS Encoding & Overhead

Technical_Authority

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SMS Encoding & Overhead

Technical_Authority