'with the arduino M0?

I'm a student with a new arduino M0. I want to use it with a GSM SIM900a. I'm new with it I made a research and I didn't get how to code the UART to make use of it. The "SoftwareSerial.h" doesn't work with the arduino M0 for that I want to learn how to use the hardware to program it. If someon can show me from were I must beggin and THANK YOU



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