Getting Hotplug react when plugging 3G netstick (with mdev)

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I'm trying to get a device running embedded linux V-2.6.31 to automatically recognize when a Huawei 3G usb stick is plugged to it, run usb_modeswitch, and communicate with the module. it seems that usb_modeswitch doesn't work well in a system that has mdev, since the path /dev/bus/usb is only being created with udev. I found a script that create this path and enable usb_modeswitch to work properly. now, all i need is automation of this process, e.g., when plugging the 3G module, hotplug will first call my script, and then usb_modeswitch. the problem is that when plugging the 3G module nothing happens when the enumeration is done (the hotplug wont run), see trace:

[83175.520000] usb 2-1: new full speed USB device using bcm5892-ohci:PORT-2 and address 3
[83175.730000] usb 2-1: not running at top speed; connect to a high speed hub
[83175.750000] usb 2-1: New USB device found, idVendor=12d1, idProduct=1f1c
[83175.760000] usb 2-1: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[83175.770000] usb 2-1: Product: HUAWEI Mobile
[83175.770000] usb 2-1: Manufacturer: Vodafone(Huawei)
[83175.780000] usb 2-1: SerialNumber: FFFFFFFFFFFFFFFF
[83175.800000] usb 2-1: configuration #1 chosen from 2 choices
[83175.870000] scsi1 : SCSI emulation for USB Mass Storage devices
[83180.910000] scsi 1:0:0:0: CD-ROM            HUAWEI   Mass Storage     2.31 PQ: 0 ANSI: 2

I'm not sure what is wrong, is there something i didn't enable? is there a KO that i need to load in order for it to work?

Thank you in advance!

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