hello, i have an arduino uno and gsm shield
here my gsm shield
i want to connect the gsm shield and arduino uno, but i just give the power to gsm shield, vcc and - .
there is UART data input and output, is there any port we must connect to them from arduino uno ?
by the way, i am using library https://github.com/itead/ITEADLIB_Arduino_SIMCom