plug my alcatel 3g modem in an usb3 port….

Cut ‘n Paste from some forum:

In the last ‘upstream’ version of usb_modeswitch, there is an additional global option SetStorageDelay in the config file “/etc/usb_modeswitch.conf”.
You can set this to “3” or anything else, and usb_modeswitch will check if this is the minimum value and set it accordingly via the respective sysfs attribute.