ubuntu 12.04 usb 3G modem not working

ubuntu 12.04 usb 3G modem not working

I have a ZTE MF190 3G Modem, service provider Reliance
I have been using it for the past 3-4 months with a few problems but repluging seemed to solve the connectivity issues.
but recently i installed or reinstalled udev as there was an exclamation mark next to it in Synaptic,
thikning that it would solve the problem but now its not,
On restart the modem is detected but google wont open
if i disconnect the modem Signal strength disappears and no bars r displayed
and reconnecting doesnt work at all
also the usb modem is not mounted under Nautilus or using > mount command

i tried :
1. sudo service network-manager restart
2. sudo ifdown -a and then sudo ifup -a
3. lsusb shows the ZTE WCDMA modem
but not in nm-tool

Also tried the soln below ... nogo
3G USB Modem Not Working in 12.04
------------------------------------

lsusb
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
....
Bus 008 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 001 Device 002: ID 0bda:0158 Realtek Semiconductor Corp. USB 2.0 multicard reader
Bus 001 Device 004: ID 05e3:0608 Genesys Logic, Inc. USB-2.0 4-Port HUB
Bus 002 Device 002: ID 064e:c107 Suyin Corp. HP webcam [dv6-1190en]
Bus 004 Device 002: ID 046d:c05a Logitech, Inc. Optical Mouse M90
Bus 001 Device 009: ID 19d2:0117 ZTE WCDMA Technologies MSM
--------------------------------------------------
usb-devices
T: Bus=01 Lev=01 Prnt=01 Port=03 Cnt=02 Dev#= 4 Spd=480 MxCh= 4
D: Ver= 2.00 Cls=09(hub ) Sub=00 Prot=01 MxPS=64 #Cfgs= 1
P: Vendor=05e3 ProdID=0608 Rev=77.64
S: Product=USB2.0 Hub
C: #Ifs= 1 Cfg#= 1 Atr=e0 MxPwr=100mA
I: If#= 0 Alt= 0 #EPs= 1 Cls=09(hub ) Sub=00 Prot=00 Driver=hub


T: Bus=01 Lev=02 Prnt=04 Port=02 Cnt=01 Dev#= 9 Spd=480 MxCh= 0
D: Ver= 2.00 Cls=00(>ifc ) Sub=00 Prot=00 MxPS=64 #Cfgs= 1
P: Vendor=19d2 ProdID=0117 Rev=00.00
S: Manufacturer=ZTE,Incorporated
S: Product=ZTE WCDMA Technologies MSM
S: SerialNumber=MF1900ZTED010000
C: #Ifs= 4 Cfg#= 1 Atr=e0 MxPwr=500mA
I: If#= 0 Alt= 0 #EPs= 2 Cls=ff(vend.) Sub=ff Prot=ff Driver=option
I: If#= 1 Alt= 0 #EPs= 2 Cls=ff(vend.) Sub=ff Prot=ff Driver=option
I: If#= 2 Alt= 0 #EPs= 3 Cls=ff(vend.) Sub=ff Prot=ff Driver=option
I: If#= 3 Alt= 0 #EPs= 2 Cls=08(stor.) Sub=06 Prot=50 Driver=usb-storage

--------------------------------------------------
ls -al /dev/serial/by-id
total 0
lrwxrwxrwx 1 root root 13 May 20 14:27 usb-
ZTE_Incorporated_ZTE_WCDMA_Technologies_MSM_MF1900ZTED010000-if00-port0 -> ../../ttyUSB0
lrwxrwxrwx 1 root root 13 May 20 14:27 usb-
ZTE_Incorporated_ZTE_WCDMA_Technologies_MSM_MF1900ZTED010000-if01-port0 -> ../../ttyUSB1
lrwxrwxrwx 1 root root 13 May 20 14:27 usb-
ZTE_Incorporated_ZTE_WCDMA_Technologies_MSM_MF1900ZTED010000-if02-port0 -> ../../ttyUSB2
--------------------------------------------------

tail -800 /var/log/syslog | grep modem
May 20 09:04:24 ubuser-HP-Pavilion-dv5-Notebook-PC modem-manager[935]: (ttyUSB2) opening serial port...
May 20 09:04:24 ubuser-HP-Pavilion-dv5-Notebook-PC modem-manager[935]: Modem /org/freedesktop/ModemManager/Modems/0: state changed (disabled -> enabling)
May 20 09:04:24 ubuser-HP-Pavilion-dv5-Notebook-PC modem-manager[935]: (ttyUSB1) opening serial port...
May 20 09:04:24 ubuser-HP-Pavilion-dv5-Note