Can you create shaped bokeh with a mobile phone camera?

Yes — it is possible, but it’s harder on a phone than on a larger-lens camera. The mask must be very small, roughly matched to the tiny phone lens, and placed very close to it. One example used a 2.5 mm star-shaped mask about half an inch from the lens, with the phone set to a wide aperture lens, optical zoom, close focus, and the background lights several meters away.

The challenge is that phone lenses are very small, so they naturally produce less visible bokeh. To make it work, focus close to the camera, keep the light sources far behind the subject, and use the longest available optical focal length if your phone has a telephoto camera. Large masks like those made for interchangeable-lens cameras generally won’t work on a phone; the cutout needs to be much smaller.

So: yes, but expect a fiddly setup and subtle results unless your phone has a telephoto lens or close-focus capability.