1. Taking off unnecessary widgets
You can turn off each panel by swiping to the right on the Home screen (in the “Today” pane), then scrolling to the bottom and selecting Edit.
From there, you can remove each panel as necessary.
2. Turn off Home screen features
Or, if you want to turn off the Today screen altogether, you can do so.
Go to Settings > Touch ID & Passcode, and scroll down to see your lock screen access. The fewer items that are on, the better.
From here, you can turn off your Today view, your Wallet access, and other features like Home Control, a new feature of iOS 10.
3. Set a strong passcode
Go to Settings > Touch ID & Passcode, and enter your existing passcode if you have one. If not, select Turn Passcode On, and then select Passcode Options.
This gives you the option of a custom alphanumeric or 6-digit numeric code, or the older four-digit numeric code.
4. Disabling Touch ID for fingerprint security
Fingerprints and thumbprints might be convenient, but they can be used against you.
Police in the US have compelled suspects to unlock their phones. To begin, you need to go to Settings > Touch ID & Passcode. Make sure the Phone Unlock setting is disabled.
5. Change Location settings
Your iPhone can track you wherever you go — so long as you’re connect to Wi-Fi while you’re there.
You can stop these “frequent locations” tracking by going to Settings > Privacy > Location Services > System Services and then Frequent Locations.
Once you’re there, turn the option Off. For extra privacy, hit the Clear History button.
6. Turn on “Find my iPhone”
Apple’s Find My iPhone can display on a map where your device is if it’s lost or stolen. Head to Settings > iCloud > Find My iPhone and make sure that it is switched on.
You may need to enter your device pass code to authorize this.
7. Enable pass code for every app purchase
For your financial security — especially if you have children — you might want to ensure that each app requires your Apple ID or your fingerprint.
That’s to prevent multiple purchases being made on your credit card after your initial authorization.
When presented with this prompt, select Always Require.
8. Limit location services for each app
Some apps will ask to use your location in the background, even when you’re not actively using them.
If you see this message, it means an app wants to keep using your location.
You may see popups and other notifications from the app, depending on where you’re located.
For perfect privacy, select Don’t Allow when it displays. You may have to do this a number of times with different apps.
This may limit an app’s function. You can always change this setting in your device’s settings.
9. Prevent apps from using your information
Your contacts, email, calendar, and your photos are some of your most personal data.
When an app wants your data, either for processing or uploading, it will tell you the first time.
You can change each app’s access by going to Settings > Privacy and selecting each app, like Contacts, and swipe on or off which third-party apps you want to grant access to.
If you have already granted an app access to your data, switching off the service on your device does not mean that service will delete your data.
You will have to contact that company or app maker for this.
10. Set expiration time for audio/voice messages
Since iOS 8, you can send voice and video messages through iMessage.
These can be indefinitely stored on your device, but the longer you keep them on your device, the greater the risk that those conversations can be read by others.
To reduce the time in which iMessage data is stored on your device, go to Settings > Messages > Keep Messages, and select the time you wish to retain your messages.
Go back a step and check the Audio Messages and Video Messages as well. These options offer shorter life-spans.
11. Change notification settings
Previews of your messages and emails can be shown on your lock screen, allowing anyone with access to your iPhone or iPad a glimpse.
To limit this feature, for example, to just showing the recipient of the message, go to Settings > Notifications and then select Messages and Mail for text messages and iMessages and email, respectively.
From each screen, you can change the preview style. For maximum privacy, disable Show Previews so messages won’t be displayed on the lock screen.