Windows Phone 8
The web browser has automatic word wrap when zooming, the user can easily read long lines without scrolling horizontally.
Android 9.0 Pie
You can add widgets to the home screen. This allows you to have more flexibility and to see information at a glance, without going into the app.
With a search browser application you can surf the internet from your device.
It can be updated over the air (OTA) w/o connecting to a computer
All your contacts and calendar dates are synced over-the-air.
With a large enough data plan, you could cancel your home internet and use the device as a hotspot.
NFC (near field communication) allows a device to perform simple wireless transactions.
You can easily manage notifications by adjusting your preferences, and you can also turn them off completely for specific apps.
The OS has a feature for tracking the position of a mobile device. This feature is particularly useful if your phone gets stolen or if you lose it.
Offline voice recognition enables you to perform voice actions, like dictating texts or using various voice commands, without an internet connection.