This is due to a typo in drivers/usb/serial/anydata.c, see
http://article.gmane.org/gmane.linux.usb.devel/45050.
The workaround is to do
modprobe usbserial vendor=0x16d5 product=0x6501
before plugging in the modem.
In my experience, the 'option' driver handles this modem better than the
anydata driver. If you feel up to building your own kernel, you should copy the
line
{ USB_DEVICE(0x16d5, 0x6501) },
in id_table from anydata.c to option.c and not build the anydata driver at all.
See
http://article.gmane.org/gmane.linux.usb.devel/44981
--
Anydata CDMA modem driver not working
https://launchpad.net/bugs/38191
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