Public bug reported:

Huawei e160 modem isn't consistently detected. It's a hit and miss affair. 
Sometimes requires several attempts of plugging in and out.
This modem also has a MicroSD card slot and this is probably what is causing 
the issue. However, no additional drive is reported or mounted automatically.
It just takes 2-5 minutes for the modem to be detected. Following which running 
it is usually hassle free. 

Using ubuntu 12.04

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: network-manager 0.9.4.0-0ubuntu3
ProcVersionSignature: Ubuntu 3.2.0-23.36-generic 3.2.14
Uname: Linux 3.2.0-23-generic x86_64
NonfreeKernelModules: nvidia
ApportVersion: 2.0.1-0ubuntu3
Architecture: amd64
Date: Sun Apr 15 17:48:06 2012
InstallationMedia: This
IpRoute:
 default via 10.64.64.64 dev ppp0  proto static 
 10.64.64.64 dev ppp0  proto kernel  scope link  src 112.79.128.134 
 169.254.0.0/16 dev ppp0  scope link  metric 1000
NetworkManager.state:
 [main]
 NetworkingEnabled=true
 WirelessEnabled=true
 WWANEnabled=true
 WimaxEnabled=true
SourcePackage: network-manager
UpgradeStatus: Upgraded to precise on 2012-03-18 (28 days ago)
nmcli-dev:
 DEVICE     TYPE              STATE         DBUS-PATH                           
       
 ttyUSB1    gsm               connected     
/org/freedesktop/NetworkManager/Devices/3  
 eth0       802-3-ethernet    unavailable   
/org/freedesktop/NetworkManager/Devices/1  
 wlan0      802-11-wireless   disconnected  
/org/freedesktop/NetworkManager/Devices/0
nmcli-nm:
 RUNNING         VERSION    STATE           NET-ENABLED   WIFI-HARDWARE   WIFI  
     WWAN-HARDWARE   WWAN      
 running         0.9.4.0    connected       enabled       enabled         
enabled    enabled         enabled

** Affects: network-manager (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug precise

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https://bugs.launchpad.net/bugs/982283

Title:
  Huawei e160 modem isn't always detected. Freezes computer briefly.

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