Open the App Store on your iPhone
Download and install a “20 Questions” app (or a “20 Questions game”)
Launch the app
Choose the option to play a game (single-player or two-player)
If playing single-player, select the difficulty (if prompted)
Enter your guess or think of an answer the app will try to identify
Tap to ask questions (or type your yes/no questions, if the app supports typing)
Answer the app’s yes/no questions by selecting Yes or No
Continue until the app guesses the item
Tap to confirm the correct answer (if prompted)
Review the result or start a new round