Hey RogerWilco, thanks for your answer.
Could you please describe the procedure to do that for me please?
Actually I'm a Mac user, but I'll use my friends computer wit OS Windows.
Thanks & Regards.
I don't have a ZTE modem so I can't offer much help. You need to download the ZTE dialler software. I don't know what it is called - similar to Sierra Wireless Watcher.
You can then issue AT commands.
OR
You can let Windows install the drivers for it, use Device Manager to find the COM port and issue the command over that.