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  • What kind of variable? And what library has the SimpleWriteln method? Commented Feb 16, 2017 at 11:20
  • im using SIM900.h. for example var1 = *100# and var2 = *122# i want to applied it like that. Commented Feb 16, 2017 at 11:27
  • gsm.SimpleWriteln is different from serial.print in many ways, including syntax. Commented Feb 16, 2017 at 13:03