GSM 2 shield,
SMS receive and transmit working perfect, make voice call, makes the call perfect, but I don't her anything (both sides of the connection, arduino and cellphone). For receive a voice call it is working also ok, I her the incoming call on my earplugs and the connection is made, but again no sound (both sides). I use a earphone and microphone from my iPhone, also with a normal headset at both sites of te connections there is also no sound. I use the standerd programs from Arduino. I hope you can help me. Greetings Pieter.