From the piece:
Explore the night
It’s always good to have a mini tripod in your suitcase; they take up no room and are great for getting shots that you otherwise wouldn’t get. (The bigger your camera, the sturdier the tripod will have to be though). Even mediocre street scenes can be brought to life by shooting them at night on long exposures. But even without a tripod, you can look for suitable level surfaces to balance your camera.
If you were after a more technical tutorial, there are plenty of 'how to's on this very site, not least this : the same principles very much apply, even if you've got a Symbian-powered smartphone.