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Can I use a USB Broadband Dongle with my mobile phone sim? - can i use my mobile broadband sim card in my phone

I have a contract with Orange unlimited internet and I later on weekends, I am my Nokia 5800 to connect to my PC via a modem, but I was advised by a representative of the orange that the only reason to 416kbps download speed Arnt can, because the telephones for broadband networks are designed so that I thinkng when this is done with a USB dongle and put my Orange SIM card and uses it on weekends and Eves of this work, I have free internet access at the time, and I better High-speed connection. Does this work?

Thanks in advance

Scott