I have a Arduino Yun, and the Seeed Studio GPRS Shield v2.
I have tried various tester codes from Arduino, from the Seeed Studio website, but none seem to produce anything in the Serial Monitor. (I'm using a Mac, and the built in Monitor that comes with the Arduino IDE.)
Nothing at all appears in the Monitor, except when I ran a test, that was just the attachment. Then it would just reprint the Not Connected.
So I'm guessing the GPRS shield isn't communicating? Please help. I'm new to Arduino and coding.
I'm not familiar with that shield, but it does not appear to be compatible with the Yun. From the shield documentation, it looks like you have a choice of hardware serial, which won't work because it's used by the Bridge to talk to the Linux processor, or there is software serial, but that requires receiving data on pin D7, but that won't work because the 32U4 can only receive SoftwareSerial on pins 8 through 11.
If you want it to work, you will probably have to do some reconfiguring and making a jumper to get the received data on a pin which works on the Yun. Read the limitation On this page: the Yun has the same processor as the Leonardo, so the same limitations on pins apply.