7 Signs Your Phone Has Been Hacked (And How to Fix It)

The most common signs your phone has been hacked include unexplained battery drain, sudden spikes in mobile data usage, apps you never installed appearing on your device, your phone running unusually hot, and receiving strange texts from unknown numbers. Recognizing these warning signs early can prevent serious damage to your personal data and financial accounts.

Mobile phone hacking is more common in 2026 than most people realize. According to cybersecurity firm Lookout, over 3.5 million malicious mobile apps were detected in 2025 alone, and the average hacked device operates under surveillance for 47 days before the owner notices anything wrong. The longer a hacker has access to your phone, the more damage they can cause.

This guide covers the seven clearest signs your phone has been hacked, exactly how to fix it for both iPhone and Android devices, and what you should do right now to prevent it from happening again.

Why Phones Get Hacked More Than Ever in 2026

Smartphones are the primary target for cybercriminals in 2026 because they hold everything: banking apps, email accounts, work credentials, personal photos, and location history. A single compromised device can give an attacker access to every account linked to that phone number, including two-factor authentication codes that protect your most sensitive accounts.

The most common attack methods include phishing links sent via SMS (smishing), malicious apps disguised as legitimate tools, public Wi-Fi interception, and SIM swapping attacks where a criminal convinces your carrier to transfer your number to their device. Zero-click exploits, which require no action from you at all, are increasingly used against high-value targets and corporate devices.

You do not need to be a celebrity or corporate executive to be a target. Automated hacking tools make it economically viable to attack thousands of ordinary users simultaneously, harvesting data in bulk from whoever clicks a link or installs the wrong app.

7 Signs Your Phone Has Been Hacked

Here are the seven most reliable warning signs that your phone has been compromised. If you recognize two or more of these simultaneously, treat it as a confirmed breach and follow the remediation steps below.

1. Your Battery Drains Faster Than Usual

Malware and spyware run in the background constantly, using processing power, accessing your camera or microphone, and transmitting data to remote servers. All of this consumes battery power at a rate well above normal app usage. If your phone’s battery life has dropped by 30 percent or more without any change in your usage habits or recent software update, this is one of the clearest signs your phone has been hacked.

Check: On iPhone, go to Settings, then Battery, then Battery Health and Usage. On Android, go to Settings, then Battery, then Battery Usage. Look for unknown apps consuming disproportionate power in the background.

2. Your Phone Gets Hot for No Reason

A phone that gets warm during heavy gaming or video streaming is normal. A phone that gets hot while sitting idle on a table, or while you are doing nothing more than reading, is a strong indicator that malicious software is running intensive background processes. Cryptomining malware is particularly notorious for causing severe overheating because it uses your phone’s processor to mine cryptocurrency for the attacker.

3. You Notice Apps You Did Not Install

One of the most obvious signs your phone has been hacked is finding applications you have no memory of installing. Malware often installs secondary apps to establish persistent access, collect additional data, or display fraudulent advertisements that generate revenue for the attacker. Scroll through your full app list at least once per month and delete anything you do not recognize.

4. Your Data Usage Has Spiked Unexpectedly

Spyware and keyloggers transmit stolen data back to command-and-control servers continuously. This creates background data consumption that does not correspond to anything you are actively doing on your phone. Check your monthly data usage summary: if you are using significantly more data than normal without any change in streaming habits, something is sending data without your permission.

Check: On iPhone, go to Settings, then Cellular, and review data usage by app. On Android, go to Settings, then Network, then Data Usage. Sort by usage and look for apps consuming data in the background that have no business reason to do so.

5. You Get Unusual Texts or Calls

If contacts are reporting that they received strange messages from your number, or if you are seeing outgoing calls and texts in your log that you did not make, your phone or phone number has been compromised. SIM-swapping attacks often result in the attacker using your number to send phishing messages to your contacts, who trust links and requests coming from someone they know.

6. Your Phone Performance Has Dropped Dramatically

Malware consumes RAM and CPU resources constantly. If your phone has become significantly slower, apps crash more frequently, the interface lags, or the device restarts unexpectedly, malicious software running in the background may be the cause. This symptom alone is not definitive, as a software update or aging hardware can cause similar issues, but combined with other signs it is highly diagnostic of a hacked device.

7. Accounts Are Being Accessed Without You

Receiving login notifications for accounts you did not access, finding unrecognized purchases in your app store, or discovering password reset emails you never requested are all signs that someone has gained access to accounts linked to your device. If your phone stores saved passwords in a browser or password manager and the device is compromised, an attacker can extract all of them.

How to Fix a Hacked Phone: Step-by-Step

If you have identified multiple signs your phone has been hacked, act immediately. The steps differ slightly between iPhone and Android.

For iPhone Users

1. Disconnect from Wi-Fi and mobile data to stop active data transmission.
2. Change your Apple ID password immediately from a different, trusted device.
3. Review installed apps: Go to Settings, then General, then iPhone Storage. Delete any unfamiliar apps.
4. Check Background App Refresh: Go to Settings, then General, and disable it for any app you do not trust.
5. Update iOS: Install the latest iOS version. Security patches close known exploit pathways.
6. Check your Apple Account for unknown devices: Sign in at appleid.apple.com and remove any devices you do not recognize.
7. Factory reset as a last resort: If the problem persists, go to Settings, then General, then Transfer or Reset iPhone, then Erase All Content. Restore from a backup made before the compromise.

For Android Users

1. Enter Safe Mode (hold the power button, then long-press Power Off) to disable third-party apps and identify if the problem stops.
2. Uninstall suspicious apps immediately while in Safe Mode.
3. Run a malware scan using a reputable security app. Google Play Protect scans all installed apps automatically.
4. Check Device Admin Apps: Go to Settings, then Security, then Device Admin Apps. Revoke access for anything unfamiliar.
5. Update Android to the latest available version for your device.
6. Review your Google Account activity: Visit myaccount.google.com and check for unknown device logins.
7. Factory reset if malware persists after the steps above.

How to Prevent Your Phone From Being Hacked

Prevention is significantly more effective than remediation. These five steps protect against the vast majority of phone hacking attempts in 2026.

First, never click links in unsolicited SMS messages, even if they appear to come from your bank or a delivery service. Always navigate directly to the official website instead. Second, only install apps from the official App Store or Google Play, and check the developer name and review count carefully before installing anything new.

Third, use a unique, strong password for every account and enable biometric or app-based two-factor authentication wherever available. Avoid SMS-based 2FA for critical accounts like email and banking, since SIM-swapping bypasses it entirely. Fourth, check whether your email or phone number has already appeared in a data breach using haveibeenpwned.com, which monitors breach databases for free. Fifth, keep your operating system and apps updated consistently, as most mobile attacks exploit known vulnerabilities that updates patch.

For additional device security guidance, including specific settings for protecting your iPhone hardware, read our iPhone troubleshooting guide and explore the latest AI security tools that can help monitor and protect your devices automatically.

Signs Your Phone Has Been Hacked: FAQ

Can a phone be hacked just by visiting a website?

Yes. Drive-by download attacks can install malware when you visit a compromised website, particularly on outdated browsers or operating systems. Zero-click browser exploits have been documented against iPhones and Android devices. Keeping your browser and OS updated and avoiding suspicious links reduces this risk substantially, though it cannot be eliminated entirely without additional security software.

How do I know if my iPhone has spyware?

Signs of iPhone spyware include abnormal battery drain, high data usage from unfamiliar processes, your phone staying warm when idle, and microphone or camera indicator lights activating without your use. You can check microphone and camera access in Settings, then Privacy and Security. Lockdown Mode, available in iOS 16 and later, blocks the majority of spyware attack vectors.

What should I do immediately if I think my phone is hacked?

Disconnect from all networks immediately, then change the passwords for your email, banking, and social media accounts from a separate trusted device. Enable two-factor authentication on all critical accounts. Run a malware scan or factory reset your device. Contact your mobile carrier to check for unauthorized SIM changes. File a report at the FBI’s Internet Crime Complaint Center (IC3) if financial accounts were accessed.

Can factory reset remove phone hacking?

A factory reset removes virtually all malware from a phone, including persistent spyware, by wiping the device back to its original operating system state. It is the most reliable fix when other methods fail. However, it will not help if the attack was SIM-based rather than app-based, and restoring from a compromised backup can reintroduce the malware. Always restore from a backup made before the suspected breach date.