1) Send a short message <1> AT CMGF = 0 <2> AT CMGS = Short Message Length <3> Enter PDU Ctrl Z
2) AT?: Display all AT Commands supported
3) AT & C [0]: Keep DCD has been driving AT & C1: Enable normal DCD use (default)
4) AT & F [0]: Restore the original setting
5) AT & K [0]: Disable Flow Control
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