SIM800L is the advanced version of SIM900 series, and the V2.0 even more advance with the ability to directly connected to the 5V pin of any Arduino boards, eliminate the need of DC Power Step Down on previous version.
Features:100% New and High QualityModel: SIM800LWork voltage: 3.7~5VNetwork support: Quad-Band 850/900/1800/1900 MHz - would work on GSM networks in all countries across the world.
TTL serial interface compatible with 3.3V and 5V MCU Microcontrollers, compatible with arduino.