All commands are case sensitive. When user tries to send SMS/GPRS message to {{{model|FMB1YX}}} that operates in Deep Sleep mode, it cannot arrive to {{{model|FMB1YX}}} device because the GSM/GPRS module is disabled most of the time. {{{model|FMB1YX}}} will receive the SMS/GPRS message when it exits Deep Sleep mode.<br/>If {{{model|FMB1YX}}} is in GPS Sleep or Online Deep Sleep mode, sent SMS/GPRS message will arrive to the device.
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Read chapter 5.10 to know how to construct a proper SMS message and send it to {{{model|FMA1YX}}} device. All commands are case sensitive. While {{{model|FMA1YX}}} operates in Deep Sleep mode and user tries to send SMS message it cannot arrive to {{{model|FMA1YX}}} device, because GSM/GPRS module is disabled most of the time (wake up depends on Send Period parameter). {{{model|FMA1YX}}} will receive the SMS when it wakes up (exits deep sleep mode).