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    I assume it requires an idle period surrounding the +++ as analog dial-up modems did? Commented Mar 27 at 14:37
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    Fun fact: only Hayes modems required the idle period, because Hayes had a patent on it. (Although apparently they licensed it out. But I encountered a modem without the guard time years later, and trolled a friend of mine with the escape sequence.) en.wikipedia.org/wiki/Time_Independent_Escape_Sequence Commented Mar 28 at 3:33
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    @grawity_u1686 is correct, according to SIM8xx AT-command manual, it requires 1 second pause before and after the escape sequence +++ to prevent the +++ from being treated as part of the data. Commented Mar 28 at 9:10