For those in the US, UK and Canada

Can you tell who is calling?

In this test there are three participants, who can use either mobile phones or landlines. In each test, one of these people is the receiver, and the other two are potential callers. The test involves 6 trials, and for each trial, the caller is selected at random. The receiver then guesses which of the other two people is the caller, before being connected to him or her. The entire test lasts less than 15 minutes and is free.

Register for the test by putting in your own name and telephone number (landline or mobile). Then enter the names and numbers of two friends (landline or mobile). If you supply a username and password, you will be able to go back and retrieve all these details at any time, to save you re-entering them. You will be able to initiate the test whenever you want. When you do, the system will call all three participants right away so please make sure you the other two people are free to take part before starting a test. When the test starts, you will all be put on the line together in a conference-call format, where you can talk to each other.

The system will tell you when the first trial is about to start. One of the callers will be selected, and the other potential caller will hear music. The receiver will be asked to guess who is the caller. The caller will then be connected with the receiver. After they have had a chance to speak for a while, the other person will be linked up again so all three can talk together until the next trial begins.

There will be six trials altogether and at the end you will all be told the results of the test. You can repeat the test at any time. But please make sure the other two people are free to take part before starting a new test.

It may sound complicated, but it's quite easy and you will be given clear instructions as you go along!

If you experience any problems, find the procedure unclear, or have any suggestions, please contact Rupert.

Begin Experiment