trouble with bluetooth on XPS 15

I recently bought an XPS 15. I 've been trying for a lnog time now to connect my phone to it via bluetooth and use my phone to connect to the internet. But the Dell always recognizes my phone (and every other phone that I connect to it) as a multimedia device. Actually no, it recognizes that it is a phone, but the services it lets my use are as if it was a multimedia device. That means it lets me transfer files, browse the mobile's folders, play music that is stored in mobile's memory but it doesn't show me the option to connect to the internet or make a call to a phone number. When I connect the same phone devices to other computers, they recognize the phones just fine. Specifically, I connected a samsung and a nokia to 3 computers (one HP netbook with windows 7 starter, one HP notebook with win7 x64 home and one Lenovo notebook with the same) and the computers recognized the mobile devices as phones and let me connect to the internet. The same nokia and the same samsung, when I connect them to my Dell XPS 15, it recognizes them as simple? multimedia? storage? devices, or whatever, I can't figure out.

I post three screenshots to make the above clearer.

In this screenshot you can see that the Dell's bluetooth recognizes my phone as a phone, modem device.

But when I double click on the phone, it doesn't show me the option to connect to the internet, as shown here.

Whereas the Lenovo netbook recognizes the phone just fine and shows the options to connect to the internet (obviously I was currently connected, so it shows disconnect) and make phone calls as shown here.

I should point out that I updated the bluetooth radio, and I updated all I could find that was related to bluetooth, and I made every update that I could find (windows update, dell update). But nothing. I even restored the Dell to its factory settings, but I couldn't make it work.