1. Find the settings on our mobile phone desktop and click, as shown in the figure below.
2. Click iTunes store and App Store, as shown in the figure below.
3. Click the appleid, as shown in the figure below.
4. Click to view the appleid, as shown in the figure below.
5. Click the purchase history, as shown in the figure below.
6. Finally, click the application with the following icon to download the application again.
Precautions:
You can't delete messages, phone calls, iPhone searches, photos, cameras, clocks, App Store, wallets, health, Safari, but you can delete:
DaoFaceTime, mail, music, map, calendar, iTunes Store, memo, address book, iBooks, game center.