SEARCH – ZTE modem AT commands –
ZTE AT-commands - disable/enable flashdrive AT+ZCDRUN=8 enable AT+ZCDRUN=9 disable stay online AT+ZOPRT=5
USING HYPER-TERMINAL [?] – http://melsabagh.blogspot.com/2010/01/zte-modem-and-vista-problem.html – (this explains a lot – pasted below)
To send AT commands to the modem, I needed to use Hyper Terminal. For some reasons, Microsoft decided to remove Hyper Terminal from Windows Vista and higher. So, I dug it out from my XP installation, tested it on Vista and, lucky me, it is still functioning. I started it, created a connection to the modem on COM-8 (I got the port number from the modem driver properties in Device Manager), and sent the AT commands to the modem...Problem solved!
This [pdf] might help understand how to useAT commands – http://download.maritex.com.pl/pdfs/wi/AT ZTE.pdf – [Size = 62 pages, 918 Kb]
UPDATED – Thursday 27 April 2011 – Found a nice (verbose) summary of AT commands *HERE* http://www.modemhelp.net/basicatcommand.shtml