Just a heads up, you can get a free unlock code for various Huawei USB broadband dongles, phones and ZTE phones Here

I just tried it on my '3' branded USB dongle (Huawei E160G) and it worked.

Also works on the Orange San Fransisco android phone looking at some other forums

Obviously done at your own risk, may invalidate warranty blah blah blah.

I found this info over at the Modaco forums