Using Siri in public places can be a drag. Either it’s too noisy for Apple’s AI assistant to understand your query, or it’s too quiet and it’s embarrassing (or even risky) to ask Siri for help.
Luckily, iOS 11 brings a Siri upgrade that changes all that: The new Type to Siri feature lets you silently send all your questions and commands. This feature comes disabled by default, but enabling it shouldn’t take more than a few seconds.