【情報來源】
原網址：
https://www.apple.com/ios/ios-15-preview/features/
（原始未刪減的網址）
短網址：
（若原網址過長時請提供短網址，反之免提供）
【情報內容】
iOS 15 起，使用者購買新裝置並透過 iCloud 備份移機時，
即便你原有的 iCloud 空間不足，仍會免費提供你移機所需的空間，
暫時擴充的空間限時三週。
Now when you buy a new device you can use iCloud Backup to move
your data to your new device, even if you’re low on storage.
iCloud will grant you as much storage as you need to complete a
temporary backup, free of charge, for up to three weeks. This
allows you to get all your apps, data, and settings onto your
device automatically.
還有內建 2FA 驗證碼產生器
Built-in authenticator
Generate verification codes needed for additional sign-in
security. If a site offers two-factor authentication, you can set
up verification codes under Passwords in Settings — no need to
download an additional app. Once set up, verification codes
autofill when you sign in to the site.
可停留在 iOS 14 繼續更新安全性更新
Software Updates
iOS now offers a choice between two software update versions in
the Settings app. You can update to the latest version of iOS 15
as soon as it’s released for the latest features and most
complete set of security updates.
Or continue on iOS 14 and stillget important security updates
until you’re ready to upgrade to the next major version.
Universal Control 最多三台
Support for multiple devices
Universal Control works with up to three devices.