Sending and receiving messages with SIM800L GSM module and arduino

      First of all here you have sim800 hardware design and hereĀ  the AT commands. SIM800L is a quad-band GSM/GPRS module that works on frequencies GSM 850MHz, EGSM900MHz, DCS1800MHz and PCS1900MHz. SIM800L features GPRS multi-slot class12/ class 10(optional) and supports the GPRS coding schemes CS-1, CS-2, CS-2, CS-3 and CS-4. The power supply for 800L is between 3.4V…

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