Mobile phones which can determine where you are from a photograph are being tried out in Bath.
The location-recognition tool is one of many advanced applications which is being tested to help manufacturers design phones of the future.
The 30 triallists are being asked their opinions of interactive games, cultural information and community interaction.
University researchers will also work with the city council to see how the technology will help tourists.
The £1.6m Cityware project makes use of wireless networks, Bluetooth and near-field communication at different locations across the city.
Researchers will be able to measure the volunteers' usage of the technologies, as well as looking at other key issues like security and privacy.