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My phone has options for outgoing message format, like Text, X.400 and Fax. What is that all about?

April 26, 2017fax format message Options outgoing phone text x.400

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My phone has options for outgoing message format, like Text, X.400 and Fax. What is that all about?

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This is for future services that may be offered on GSM networks, for sending these types of message direct from a handset without the need for a computer and data card (e.g. X.400 is an e-mail protocol). At present, you should leave it set to Text for normal SMS usage.