Spent a bit of time to configure my Nokia mobile to teethering wih my Linux and T-Mobile. Here is some steps that may help the others :

If you don’t have that blue bluetooth led switched on on your Dell Latitude D630 Laptop you have to enable it. I haven’t find any way to do that [...]

So if you have network-manager not detecting wireless networks it is probably because lately the driver need to be set as up to get the thing going.
On my Debian I have added this to make it works :
echo “/sbin/ip link set wlan0 up”|sudo tee /etc/default/NetworkManager

So if you get that shiny new Dell desktop and ACPI spit bunch of message at the install time and the network driver does not get detected you can follow these steps to have it working.
- Continue the install without the network until you reboot to grub.
- Add hpet=disable at the end of the boot [...]