All I was trying to do was put the modem in data mode so that I could do FTP. I worked around this by using “atd99**#” instead of “at+cgdata=1”. This gave me back a single, solicited “OK” response code, and I was able to start the IP stack, open the GPRS bearer, set the APN name, start the GPRS bear, create the FTP socket, and download my file. The [ETX] after the file transfer appears to be the thing that is causing my problem, but I think I can work around that.