I am still affected by this bug on a fully updated precise. For me, this is 
completely unrelated to 3G.
When I uncheck "Enable Wireless" in nm-applet, I cannot re-check it, and in 
"Network Settings" I see airplane mode is on, which cannot be disabled.
This workaround helps (from 
http://askubuntu.com/questions/119195/cannot-disable-airplane-mode):
sudo rfkill unblock wifi

>From lspci -v on the affected machine:
02:04.0 Network controller: Intel Corporation PRO/Wireless 2200BG [Calexico2] 
Network Connection (rev 05)
        Subsystem: Hewlett-Packard Company nc6120/nx8220/nw8240
        Flags: bus master, medium devsel, latency 64, IRQ 21
        Memory at d8000000 (32-bit, non-prefetchable) [size=4K]
        Capabilities: <access denied>
        Kernel driver in use: ipw2200
        Kernel modules: ipw2200


** Changed in: network-manager (Ubuntu)
       Status: Expired => Confirmed

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https://bugs.launchpad.net/bugs/997114

Title:
  Airplane Mode is turned on when WiFi is turned off, even though I
  don't want Airplane Mode: I want to use 3G

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