Siri: Siri helps you with the things you do every day. Siri can send messages, place phone calls, schedule meetings, and even turn on and off VoiceOver, Guided Access, and Invert Colors. And because Siri is integrated with VoiceOver, you can ask where the nearest sushi restaurant is and hear the answer read out loud. With Siri Shortcuts, you can now cue custom, multi-action commands by voicing a preferred phrase. If you’re commuting home, for example, say “Heading Home” to get directions, bring up a favorite podcast, and adjust your thermostat — without having to go into each individual app.
Allows the user to perform many tasks by voice. Tasks include making phone calls, reading, composing and sending emails and text messages, controlling smart home appliances, opening applications, getting basic information such as time, date and weather, performing Google searches, having the news read, playing music, creating shopping lists, viewing and creating reminders, adding items to your calendar, setting alarms, doing math, looking at photos setting a kitchen timer, translating language, converting measurements and currencies and more.
Communication
Through simple voice commands, people can send text messages or emails, speak incoming messages or emails, place phone calls or obtain contact information.
Organize Day
Create a schedule, reminders or to do list, set an alarm and ask Assistant to remind you of various items.
Control Smart Home Applications
Control your lights, temperature, music and appliances in your home.
Obtain Information
Use Siri to obtain an almost limitless amount of information, such as health information, the weather, traffic conditions, local entertainment and more.
Source: https://www.razmobility.com/ios-built-in-accessibility/#learn-more