How to download apps on iPhone?

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I see you are asking about how to download apps to your iPhone. From this document -->

Download apps and games on your iPhone or iPad - Apple Support

1. On your iPhone or iPad, open the App Store app.
2. Browse through the Today, Games, Apps, or Arcade tabs to find apps you like. Or tap the Search tab to look for something specific. If you find a game that says Arcade, subscribe to Apple Arcade to play the game.
3. 
   
4. 
5. Tap or click the price or Get button. If you see the Open button
6. instead of a price or Get button, you already bought or downloaded that app.

In the App Store, if an app has a Get button instead of a price, the

app is free. You won't be charged for downloading a free app. Some free

apps offer in-app purchases and subscriptions that you can buy.

Subscriptions and in-app purchases give you access to more features,

content, and more.

If you can’t download or update apps on your iPhone or other Apple device -

If you can’t download or update apps on your iPhone or iPad - Apple Support

M1 Mac mini, macOS 13.1; Watch, series 7 GPS/cellular, watchOS 9.2; iPad Pro 2nd Gen, iPadOS 16.2; iPhone 12 Pro, iOS 16.2; TV 4th Gen, tvOS 16.2; HomePods, audioOS 16.2 and Airport Express w/ Airplay 2