Funny thing is that both Arduino MEGA and GSM_Shield library are "supported" by the IComSat.(At least it's said in its website :p)
Hey, GOOD news!I had the amazing idea of opening the GSM_Shield.cpp and change all the "mySerial" for "Serial1", and deleting all the #include NewSoftSerialBy doing this, I just changed the comunication to Serial1 (pins 18 and 19) of MEGA, so I jumped the RX to the TX to these pins aaaaaand... the results are the following:system startupno callno callno call...And when I called the shield from my cellphone:incoming voice call from xxxxxxxxx (my number)YES, it's working!! I'm so happy!! That's it my friends!