jgalaxy:
netoreboucas85:
My problem was this: I could connect with Shield using SoftwareSerial, could see the startup Shield in the serial monitor (like "Call ready"), but when try send a simple AT nothing is response.
On first moment I solved using a simple wire jumper.So why does this jumper resolve the problem?
I posted my solution on the Stackoverflow (efcom v1.2 shield not communicating (Arduino & GSM/GPRS) - Stack Overflow), summarizing I used RX instead of S_RX and used TX instead of S_TX.
I'm using a Arduino Mega and I'm using Serial1 instead of SoftwareSerial. The RX of the Shield is connected to the TX1 of the Arduino (Pin 18 - Serial1), and the TX of the Shield is connected to the RX1 of the Arduino (Pin 19 - Serial1)