Three are soon to release their Mobile Broadband Router. The D100 Router is a device which will allow you to connect up to 4 Wi-Fi enabled devices to the internet using one Mobile Broadband Dongle.
For more information on using Mobile Broadband with a Router visit:
I will update with a release date when I find out when it is, or keep an eye on the Three website here.
For more information on offers from Three, click here.