Securing your cell phone takes four core moves: a six-digit-plus screen lock, prompt system and app updates, two-factor authentication on every sensitive account, and lost-device tracking turned on before you need it.
A stolen phone with no passcode is an open wallet — email, banking, photos, and every saved password sitting in one hand. The FTC’s guidance on protecting your phone puts the fix in a handful of settings, and most of them take under two minutes to turn on. Do these in order, starting with the lock.
What Does A Strong Screen Lock Actually Require?
An automatic screen lock with a passcode of at least six digits, per the FTC, is the baseline.
Find it in Settings > Face ID & Passcode (iPhone) or Settings > Security > Screen lock (Android), then set the auto-lock timer as short as you can tolerate. When it works, the phone asks for the code the moment the screen wakes. Fingerprints and face unlock are convenience layers — keep the passcode behind them rather than replacing it.
Why Updates Beat Almost Every Other Safeguard
Operating-system and app updates ship the security patches that close known holes, and Apple’s own support page calls keeping software current the single most important security action for its products. The FTC recommends the same and adds one instruction: stop postponing them.
Turn on automatic updates so you are never the person running a year-old system. On iPhone: Settings > General > Software Update > Automatic Updates, toggle on. On Android, look for Settings > System > System update. App updates live in the App Store or Play Store settings — switch on auto-update there too, and delete apps you no longer open.
How Do You Lock Down Accounts And Stolen-Phone Risk?
Two-factor authentication on your Apple Account, Google Account, email, banking, and social accounts means a stolen password alone stops working. Turn it on for each one; most take a verification code or an authenticator app.
iPhone owners on iOS 17.3 or later get an extra layer: Stolen Device Protection. It requires a device passcode, Face ID or Touch ID, and Apple Account two-factor authentication, then adds biometric checks and a security delay before someone can change sensitive settings while the phone is away from a familiar location. Enable it under Settings > Face ID & Passcode > Stolen Device Protection. Newer iPhones and the latest iOS are needed — older models skip this one, which makes the strong passcode and account 2FA do the heavy lifting instead.
Which Lost-Device Controls Should Be On Right Now?
Find My (iPhone) or Find My Device (Android) must be switched on before a loss — it is the only way to locate, remotely lock, or erase a missing phone afterward. The FTC recommends enabling it and keeping a backup so your data survives theft, damage, or loss.
On iPhone: Settings > [your name] > Find My > Find My iPhone, and turn on Find My network. On Android: Settings > Security > Find My Device. Back up to iCloud or Google Drive with a strong password on that account. These controls only work while the phone can reach the network, so they are a head start, not a guarantee.
Lockdown Mode exists too, but Apple intends it for the very small number of people facing highly sophisticated attacks — it restricts apps, websites, and attachments. If you fall in that group: Settings > Privacy & Security > Lockdown Mode > Turn On Lockdown Mode, after updating every device first.
Choosing A Phone That Starts Secure
Hardware matters less than settings, but a phone that still receives security updates for years gives the settings above a longer runway. If you are shopping for one, this roundup of the best cell phones for security weighs update commitments and built-in protections.
Before you trade in or recycle a phone: back it up, remove the SIM and any SD card, erase the device, unlink accounts and paired devices, and remove it from the trusted-device lists your two-factor authentication relies on.
The full FTC checklist covers the same ground. The FTC’s phone security guide is the authoritative source for lock, update, backup, and lost-device advice.
Common Questions
Is a six-digit passcode really more secure than four?
Yes. Each added digit multiplies the possible combinations by ten, so six digits gives a million combinations against ten thousand for four. Combine that with a short auto-lock timer and the odds of someone guessing their way in drop sharply.
Does Stolen Device Protection work on older iPhones?
No. Apple requires iOS 17.3 or later plus the hardware for Face ID or Touch ID, a device passcode, and Apple Account two-factor authentication. On older phones, a strong passcode and two-factor authentication on your accounts carry the load.
What if I lose my phone before turning on Find My?
Options narrow badly. Remote location, locking, and erasure generally need the feature enabled beforehand, so call your carrier to suspend the line and change the passwords on accounts the phone could access, starting with email.
Sources
- Federal Trade Commission. “How to Protect Your Phone from Hackers.” Supports the passcode, update, backup, and lost-device recommendations.
- Apple. “About Lockdown Mode and Stolen Device Protection.” Supports Lockdown Mode and Stolen Device Protection requirements and settings paths.