Can ios 15 be used normally after the update?

It depends on the situation. It can be used normally when downloading, but not when installing.

IOS update is divided into two parts, download update and install update. You can use it normally when downloading the update, but you need to restart your phone when installing the update, so it can't be used normally.

In Settings-General-Software Update, you can turn on automatic update and automatically install software update at night after downloading.

You will be notified before updating the installation. IPhone must be charged and connected to WLAN to complete the update.

IOS 15 upgrades FaceTime video calling to bring spatial audio technology. With the help of multiple microphones and internal audio processing algorithm, video call has real sound field effect.

FaceTime also supports "speech enhancement mode", which shields background noise through algorithms and can obtain clear speech in noisy environment; The new version of FaceTime also supports automatic beauty in videos, and can also achieve good results in multiplayer videos.

IOS 15 has improved the notification function, designed a new notification interface, and the contact photos and App icons are larger, which is more convenient for users to identify.

IOS 15 also introduces the notification digest mode. Notification summaries can be sent in batches at the time specified by users and arranged in order. Notifications from people will bypass the summary and be sent immediately, so users will not miss them.