创建拨号连接，并可选择拨号，可携带AT命令进行拨号，可列出所有的拨号连接，也可以将创建的拨号创建为一个可见拨号连接-Create a dial-up connection, and can choose dial-up, can carry the AT command to dial, you can list all the dial-up connection, you can also create a dial-up dial-up connection is created as a