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This free to use online tool allows you to encode and decode SMS PDU strings for GSM. It uses Javascript which allows you to see and understand the underlying conversions. It supports 7 bit (packed), 8 bit and 16 bit formats. Allows configuring message class and requesting receipts. Implements relative validity requests or disabled validity. The source code is available to examine - written by Swen-Peter Ekkebus; updated for this site by Andrew Alexander.
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