Old smartphones can stay useful for years, but outdated security settings often leave them exposed to malware, phishing, and account takeover.
This guide explains how to update old smartphone security settings in a way that improves protection without making the device harder to use.
Why older smartphones need a security review
Phones that are no longer receiving frequent operating system updates often keep older defaults for screen locks, app permissions, network access, and account recovery.
Even when the hardware is still fast enough, the security posture may be weak because settings were never revisited after the device was first set up.
Older devices are especially vulnerable when they:
- Run outdated versions of Android or iOS
- Use short PINs, weak passwords, or no lock screen at all
- Allow broad access to contacts, photos, location, microphone, or camera
- Automatically join unknown Wi-Fi networks
- Have too many apps with persistent background access
Learning how to update old smartphone security settings is less about one big fix and more about tightening several small ones that reduce risk together.
Start by checking the system software
Before changing any security controls, check whether the phone can still receive official updates from Apple or the device manufacturer.
Security patches address known vulnerabilities, and they are the most important layer of defense if they are still available.
What to look for
- iPhone: Go to Settings > General > Software Update
- Android: Go to Settings > System > Software update or Settings > About phone
- Review both operating system updates and security patch level
If the device is no longer supported, focus on hardening the settings that are still under your control.
On unsupported phones, these changes matter more because they compensate for missing patches.
Strengthen the lock screen first
The lock screen is the front door to the device, so it should be stronger than a simple four-digit code if possible.
A longer PIN, passcode, or alphanumeric password is much harder to guess, especially against casual theft.
Recommended lock settings
- Use a 6-digit PIN or longer, or a strong password
- Disable pattern unlock if it is easy to observe
- Set the device to lock automatically after a short idle period
- Turn off lock screen message content previews if others can see the screen
Biometrics such as Face ID and fingerprint recognition are useful because they increase convenience while preserving strong authentication.
On older devices, confirm that a passcode fallback is still enabled and robust.
Review biometric and authentication settings
Biometric unlock can be secure, but it should not be the only thing protecting the device.
Facial recognition and fingerprints work best when combined with a strong device passcode and updated account recovery settings.
Check whether your phone allows:
- Fingerprint or facial recognition only for unlocking, not for every sensitive action
- Separate authentication for app purchases and password changes
- Passcode required after restart
- Authentication required after a short inactivity period
This is one of the most overlooked steps when people ask how to update old smartphone security settings, because many older phones still allow convenience settings that are too permissive.
Audit app permissions carefully
Apps often accumulate permissions over time, especially on phones that have been used for years.
A weather app does not need constant access to contacts, and a flashlight app should not need microphone or location access.
Permissions to review
- Location
- Camera
- Microphone
- Contacts
- Photos and media
- Bluetooth and nearby device access
- Calendar and reminders
On iPhone, review permissions in Settings > Privacy & Security.
On Android, check Settings > Security & privacy or Settings > Apps > Permissions.
Remove any permission that does not match the app’s core purpose.
Also delete apps you no longer use.
Unused apps still pose risk if they remain installed, especially if they have access to sensitive data.
Update account security and recovery options
A secure phone is only as safe as the accounts attached to it.
Email, cloud storage, messaging apps, and banking services should all use strong authentication because they often contain the data most attackers want.
Account settings to improve
- Use a unique password for each major account
- Turn on two-factor authentication or multi-factor authentication
- Confirm recovery email addresses and phone numbers are current
- Review trusted devices and signed-in sessions
- Remove old backup codes from insecure locations
For older smartphones, account protection is especially important because a compromised email account can be used to reset passwords across other services.
If possible, use an authenticator app or security key rather than SMS alone.
Secure Wi-Fi, Bluetooth, and mobile network settings
Radio settings are easy to ignore, but they can expose an older phone to tracking or unwanted connections.
Tightening these controls reduces attack surface in public spaces and at home.
Network settings to change
- Disable automatic connection to open Wi-Fi networks
- Forget networks you do not use anymore
- Turn off Bluetooth when not needed
- Use personal hotspot settings only with a strong password
- Check that mobile data roaming is disabled unless necessary
On modern operating systems, you can often limit Wi-Fi and Bluetooth scanning even when the radios are off.
That helps reduce background location leakage and energy use at the same time.
Turn on built-in anti-theft and privacy tools
Most smartphones include device-finding and remote-protection features that should be enabled before a loss occurs.
These tools can help you locate, lock, or erase the device if it is stolen.
- Apple: Find My, Activation Lock, and Lost Mode
- Google: Find My Device and remote erase
- Samsung: Find My Mobile and remote controls
Also review privacy options such as ad tracking, app activity sharing, and diagnostic data.
Limiting unnecessary data collection reduces exposure without affecting everyday use.
Clean up browser and messaging security
Older phones often store years of browsing history, cached logins, and saved form data.
That information can be valuable to anyone who gains access to the device or a synced account.
Browser settings to check
- Clear saved passwords only if you use a secure password manager first
- Disable pop-ups and deceptive redirect permissions
- Review site notifications and revoke suspicious sites
- Turn on safe browsing or fraud protection features
For messaging apps, enable registration lock, chat backups with encryption if available, and notification privacy on the lock screen.
Older devices are often used as secondary phones, which makes messaging security easy to overlook.
Remove risky software and unused admin access
Old phones sometimes accumulate apps, profiles, and settings from previous owners, work use, or temporary troubleshooting.
These items can create hidden security problems.
Check for:
- Device administrator apps on Android
- Unknown configuration profiles on iPhone
- Third-party app stores or sideloading settings
- Accessibility permissions granted to apps that do not need them
- VPN profiles you do not recognize
Accessibility permissions deserve special attention because malicious apps can misuse them to read screens, automate taps, or capture text.
If an app does not clearly need those permissions, remove them immediately.
When to reset the phone
If the device has been heavily modified, shows signs of malware, or has too many unknown settings to review confidently, a factory reset may be the safest option.
Back up important photos, contacts, and documents first, then restore only what you actually need.
A reset is especially useful when:
- You inherited the phone and do not know its history
- It was used for work or shared among multiple users
- Security settings were changed repeatedly and never cleaned up
- Apps behave strangely or permissions look inconsistent
After the reset, reinstall only trusted apps and reapply the security settings above one by one.
That makes it easier to spot problems early.
Ongoing habits that keep an old phone safer
Security settings are not a one-time task.
Old smartphones stay safer when you review them regularly and remove anything unnecessary.
- Check for updates monthly
- Review app permissions every few months
- Delete unused apps and old accounts
- Keep backups current and encrypted
- Avoid public Wi-Fi for sensitive logins unless you trust the network
With a focused review of software, authentication, permissions, network controls, and account recovery, an aging device can remain much safer than its default setup suggests.