What is the ruling on participating in the "Who Wants to Be a Millionaire" competition, and what is the evidence for its permissibility or impermissibility?

It is not permissible to participate in this competition due to its inclusion of prohibited gambling ( Maysir ). Gambling is any transaction that involves loss or gain, where the participant does not know whether they will gain or lose. In this case, the participant pays the cost of their phone call hoping to win a prize, but they may not win anything. This is the prohibited gambling. It should be noted that the revenue from the calls exceeds the prizes, making it a cunning way to earn unlawful profit.