Ok then I tried,
Between the command and the answer, I delayed it with 1sed, then 2sec, then 5sec and lastely 10sec. In order to make sure that the command have time to sent.
In all case, I only got an "OK" for the other commande, it return a empty line like \n\r.
I just would like to mentionned, I put the SIM card to my smartphone, and I could go the the web, send message.
Setting up APN Context
Activating PDP Context
Configuring TCP connection to TCP Server
OK
Starting TCP Connection
I supposed an empty line is not good?
Cheers