iPhone stores a lot of information about the actions you take. This usually makes it easier to use. For example, you can find the site you want in your web browser history, or the phone number from which you missed a call. If you want to hide from strangers in your phone what they should not see, in this case, you can simply clean up the history of using all kinds of services on your iPhone, or delete it completely.
Steps
Method 1 of 7: Browsing History in Safari

Step 1. Open the Settings app
This will clear your history not in Safari itself, but in the Settings app. In Safari itself, it is possible to clear your browsing history, but this will not delete autofill data and cookies. Deleting history through Settings will ensure that the visit history will be really and permanently deleted.

Step 2. Scroll down the menu and select "Safari
" It should be in the fifth group of settings.

Step 3. From the Safari menu, scroll to "Clear History and Site Data" and select it
A confirmation dialog box appears.
If the button is grayed out, then you need to disable website restrictions. Return to the Settings menu, where on the "General" tab select "Restrictions". Enter your restrictions password, then click on "Websites". Select "All Websites" to enable permission to delete all history. If you have forgotten or do not know the restriction password, you will not be able to clear the history

Step 4. Confirm that you really want to delete the history
This will delete all website browsing history, cache, autocomplete data, and cookies. It will also delete history from all devices paired through your iCloud account.
Method 2 of 7: Browsing History in Chrome

Step 1. Open the Chrome app
If you are using Chrome on your iPhone, you can delete all history yourself right in the app.

Step 2. Call up the menu by pressing the (⋮) button and select "Settings
" To see this item, you have to scroll down the menu a little.

Step 3. Select the "Personal data" item
A new menu will appear with various cleaning options.

Step 4. Select "Browsing History" to clear your web browsing history
Next, you need to confirm your choice in the dialog box that appears.

Step 5. Click "Clear All" to delete all data saved by the web browser
This will delete all history, cache, site data and cookies.

Step 6. Click "Delete Autofill Data" to delete all autofill data
This will remove the suggestions that appear below the text boxes when you select them.
Method 3 of 7: Call History

Step 1. Open the Phone app
Here you can clear the call history that appears in the list of recent calls.

Step 2. Select the "Recent" tab
You will see a list of received and received calls.

Step 3. Click "Edit" in the upper right corner
A red minus will appear next to each call in the list.

Step 4. Use red cons for selective deletion
Mark the calls that you want to delete with red minuses.

Step 5. Click "Delete" to delete all content in one go
If you want to clear the entire list at once, just select "Delete" in the upper left corner. This item appears only after clicking "Change". All Recents content will be removed.
Method 4 of 7: Story in iMessage

Step 1. Open the Messages app
You can delete your chat history right in the Messages app.

Step 2. Click on the "Change" button
It's in the upper left corner.

Step 3. Select the conversations you want to delete
Check the box next to each conversation you want to delete.

Step 4. Click "Delete" after everything you want is checked
All correspondence will be deleted without a window with a preliminary confirmation.

Step 5. Change the settings for maintaining chat history
By default, the Messages application stores the entire conversation history for the entire time you use the phone. You can make sure that the history is stored only for the last 30 days. This will free up memory and, to a certain extent, put things in order:
- Open the Settings app.
- Select "Messages"
- Select "Leave Messages".
- Choose how long you want to keep your chat history. After that, all messages older than the specified period will be automatically deleted.
Method 5 of 7: History Keyboard

Step 1. Open the Settings app
If you want to clear the AutoCorrect dictionary from which the iPhone prompts you for words, you can do so through the Settings app.

Step 2. Select "General
" A list of your iPhone's basic settings will open.

Step 3. Scroll down and tap "Reset
" A list of reset options appears.

Step 4. Select "Reset Keyboard Dictionary
" In the dialog that appears, you must confirm your choice. All saved custom words will be deleted.
Method 6 of 7: Google app

Step 1. Open the Google app
If you use the Google app to search the web, you can delete your entire Google search history in this app.

Step 2. Click the gear-shaped icon in the upper left corner
This will open the Settings menu.

Step 3. Scroll down and select "Privacy
" Here you will see the currently active account.

Step 4. Select "History and Cookies"
The "History" section will appear at the top of the screen.

Step 5. Select "Clear device history" to clear your search history
Note that this will remove search terms from the app, but it will not remove them from your active Google Account.
Method 7 of 7: Deleting All Data

Step 1. Use this method if you want to clean your iPhone completely
This will delete all history and all information from your iPhone, and when finished, the setup wizard will launch, just like when you first turn on a new iPhone.

Step 2. Open the Settings app
If you are sure you want to delete all information from your iPhone, open the Settings app.

Step 3. Select the "General" item
A list of your iPhone's basic settings will open.

Step 4. Scroll down and select "Reset
" A list of reset options appears.

Step 5. Select "Erase Content and Settings"
By confirming your choice, you agree to the complete cleaning of the phone's memory.

Step 6. Wait for the iPhone to restart
This process will take some time.

Step 7. Set up your iPhone
When the reset is complete, the initial setup wizard will start. Here you can set up your iPhone like it's a brand new phone, or restore with iTunes and iCloud backups.