Amazon.com: SIM800L Module, 5V SIM800L Module GSM GPRS SMS with Antenna Replacement for SIM900A for 3.3 V and 5 V Single Chip Microcomputer : Electronics
Electronics and Embedded Systems, Microcontrollers, Arduino: Design power supply for SIM800L Core Board
Interface a SIM800L GSM GPRS module with Arduino - ElectroVigyan