Dial-up Connection Error 756 – This connection is already being dialed
Dial-up connection error 756 is caused when the dial-up connection that is being initiated is already begin dialed. This can be caused by redial of previous unsuccessful dial-up attempt.
To fix dial-up connection error 756, try to disconnect the connection through AT Command Tester and retry connecting again. In some cases, disconnect the modem altogether from the system and retry.
Module , M2M , GPRS , 3G , through AT commands,