How to Tell If Your Phone Has Been Hacked (Signs + Fixes for iOS & Android)

Your phone shows clear signs when it's been hacked: unexpected battery drain, unfamiliar apps, strange outgoing messages, or unprompted 2FA requests. On iPhone, check for unknown configuration profiles and unrecognized devices on your Apple ID. On Android, watch for unauthorized admin apps and sideloaded software. Most compromises are fixable by running a security scan, removing suspicious apps, changing passwords, and updating your OS.

Your phone knows everything about you: your passwords, your bank accounts, your location, your private conversations. That's exactly what makes it such an attractive target for hackers.

The troubling reality? Mobile attacks surged 52% in 2023, reaching 33.8 million incidents (Kaspersky), and by 2024, an average of 2.8 million attacks hit phones every single month (Kaspersky). Yet most people don't know they've been compromised until the damage is done.

The good news: phones leave clues. If you know what to look for, you can catch a hack early and undo most of the damage. This guide walks you through the warning signs for both iPhone and Android, how hackers get in, and exactly what to do to take back control.

Can your phone actually be hacked?

Yes, but the risk level varies significantly by platform and user behavior.

iPhones are widely considered the gold standard in mobile security. Apple's strict App Store vetting, app sandboxing, and built-in security features make mass compromise difficult. That said, they're not immune. Advanced commercial spyware like Pegasus has infected even fully updated, non-jailbroken iPhones via zero-click exploits, though these attacks are extremely rare and typically target journalists, activists, and public figures.

Android devices face a broader threat surface. Android's open ecosystem, with its many device manufacturers, flexible sideloading options, and fragmented update schedules, makes it a larger target. Kaspersky found that 40% of mobile threats in 2023 were adware, often embedded in free apps, with banking trojans not far behind.

If you use a smartphone, you're a potential target. The question is whether you'd recognize the signs.

10 warning signs your phone has been hacked

Not every symptom on this list is a guaranteed indicator of a hack; some have innocent explanations. But if you're seeing multiple signs at once, take it seriously.

1. Rapid, unexplained battery drain

Spyware and malware running in the background consume power constantly, monitoring your location, recording calls, or sending your data to remote servers. If your battery is draining faster than usual and you haven't changed your habits, it's worth investigating.

Note: A single instance of battery drain can simply mean a recent OS update or a power-hungry app. Combined with other signs, treat it as a red flag.

2. Unusual data usage spikes

Malicious software needs to communicate, and that communication uses your data. If your monthly data bill has jumped or an app is consuming far more data than it should, a hidden process may be transmitting your information to a third party.

How to check:

• iPhone: Settings > Cellular > scroll to see data usage per app
• Android: Settings > Network & Internet > Data Usage

3. Your phone is running hot, even when idle

Phones warm up during heavy use. But if your phone feels unusually hot while sitting on a table doing nothing, background malware could be running processes that shouldn't be running.

4. Apps you don't remember installing

This is one of the clearest signs something is wrong. Unfamiliar apps, especially ones with broad permissions, could be spyware or stalkerware installed by someone with physical access to your device. In May 2024, a banking trojan called Anatsa was discovered in Google Play disguised as PDF and QR reader apps, together accumulating roughly 70,000 installs before being flagged (BleepingComputer).

5. Strange calls, texts, or emails you didn't send

If your contacts are receiving messages from you that you never wrote, or if you're seeing outgoing calls you don't recognize, a hacker may have access to your phone or accounts. This can also indicate a SIM-swapping attack.

6. Unprompted two-factor authentication (2FA) requests

Receiving a 2FA code you didn't request is a serious warning sign. It means someone is actively trying to log into one of your accounts from a new device. Don't approve the request. Change that account's password immediately.

7. Unfamiliar charges on your phone bill or bank account

Hackers may sign your number up for premium SMS services or drain linked financial accounts. Review your statements regularly and flag anything unfamiliar.

8. Slow performance and frequent crashes

Persistent slowdowns or an unusually sluggish phone can signal malware consuming CPU and memory in the background.

9. Websites look different or redirect unexpectedly

If your browser is sending you to unfamiliar pages or showing excessive ads, you may have a browser-hijacking infection. This is more common on Android but can affect iPhones too.

10. Your camera or microphone activates without you touching them

On Android, indicator lights should only activate when you're actively using those features. On iPhone, iOS shows orange and green dots at the top of the screen whenever your mic or camera is in use. Check these regularly.

Also watch for signs your phone may have been cloned, which can produce many of the same symptoms listed above.

iPhone-specific warning signs to watch for

Because iOS is more locked-down than Android, genuine hacking signs on iPhones tend to be more specific:

• Unknown configuration or MDM profiles. Check Settings > General > VPN & Device Management. On a personal iPhone, this should be empty or contain only profiles you knowingly approved. Unknown entries are a serious red flag.
• An Apple ID you don't recognize. Go to Settings > [Your Name] to see all devices signed into your Apple ID. Any device you don't recognize means someone else has access.
• An official Apple threat notification. Apple proactively alerts users it believes have been targeted by advanced spyware. If you receive one, verify it came from Apple itself, not a scammer impersonating them.
• Unprompted 2FA prompts on your Apple ID. This signals someone is actively attempting to log in from an unfamiliar device.

Myth to bust: Viral posts claim "secret codes" like *#21# reveal if your phone is hacked. These are standard MMI codes used to check call forwarding settings. They are not spyware detectors. Don't rely on them.

Android-specific warning signs

Android's more open system creates some unique indicators:

• Apps installed from unknown sources. If sideloading is enabled (Settings > Apps > Special App Access > Install Unknown Apps), malware can install itself without going through the Play Store.
• A rooted device without your knowledge. Rooting gives an app or hacker complete control over your device, bypassing Android's security sandbox.
• Google Play Protect warnings. Android has a built-in malware scanner. If it flags an app, take the warning seriously.
• Sudden appearance of admin apps. Check Settings > Security > Device Admin Apps. You shouldn't see any apps there that you didn't intentionally grant admin access to.

According to Zimperium's 2024 zLabs Global Mobile Threat Report, 82% of phishing sites now specifically target mobile devices (Infosecurity Magazine), making Android users a particularly attractive target due to the platform's broader install flexibility.

How do phones get hacked? The main attack methods

Understanding how hackers get in is the first step to keeping them out.

Phishing and smishing

The most common entry point. Attackers send convincing emails, SMS messages, or messaging app links that trick you into handing over passwords or installing malware. According to Lookout's 2024 Annual Mobile Threat Report, enterprise iPhones faced twice as many phishing attempts as Android devices in 2024.

Malicious apps

Malware hides in apps on both official and unofficial stores. Android is more vulnerable due to sideloading, but even the App Store has let through malicious software.

Unsecured public Wi-Fi

Hackers can set up fake Wi-Fi hotspots at cafés, airports, and hotels. When you connect, they can intercept your traffic, steal credentials, or push malware to your device via a man-in-the-middle attack.

SIM swapping

Attackers convince your mobile carrier to transfer your phone number to a SIM card they control. Once they have your number, they can intercept SMS-based 2FA codes and access your accounts.

Physical access and stalkerware

Someone with brief physical access to your unlocked phone can install stalkerware that silently tracks your location, messages, calls, and activity. This is often a tactic in domestic abuse situations.

Zero-click exploits (advanced, rare)

State-sponsored spyware like NSO Group's Pegasus can compromise a phone without the user clicking anything, by exploiting vulnerabilities in messaging apps or the OS. These attacks are highly sophisticated and typically target high-risk individuals.

How to fix a hacked phone: step-by-step

If you suspect your phone has been compromised, act quickly and methodically.

Step 1: Run a security scan

Install a reputable mobile security app and run a full scan. For Android, a trusted antivirus tool can detect and remove most malware. For iPhone, iOS's sandboxing prevents traditional full-system scans, but security apps can flag suspicious profiles and behavior.

Pro tip: On Android, also run Google Play Protect: Open Play Store > Profile icon > Play Protect > Scan.

Step 2: Delete any suspicious or unfamiliar apps

Go through every app on your phone. If you don't recognize it or remember installing it, delete it.

• iPhone: Press and hold the app > Remove App > Delete App
• Android: Long-press the app > App Info > Uninstall

Step 3: Update your OS and all apps

Software updates patch the vulnerabilities hackers exploit. Install any pending updates immediately and enable automatic updates going forward.

• iPhone: Settings > General > Software Update
• Android: Settings > System > Software Update

Step 4: Revoke suspicious app permissions

Review which apps have access to your camera, microphone, location, contacts, and messages. Revoke access for any app without a clear, legitimate need.

• iPhone: Settings > Privacy & Security > review each category
• Android: Settings > Privacy > Permission Manager

Step 5: Change your passwords, starting with your most critical accounts

Start with email, banking, and your Apple ID or Google account. Use strong, unique passwords and store them in a reputable password manager. Enable 2FA with an authenticator app, not SMS.

Step 6: Check for unknown configuration profiles (iPhone only)

Go to Settings > General > VPN & Device Management. Delete any profiles you don't recognize.

Step 7: Sign out of unknown devices

• iPhone: Settings > [Your Name] > scroll to see signed-in devices > tap any unknown device > Remove from Account
• Android: myaccount.google.com > Security > Your Devices > Remove any unrecognized device

Step 8: Factory reset as a last resort

If the problem persists or the compromise is severe, a factory reset wipes everything and removes virtually any malware.

Back up your data first. After resetting, restore only from a backup made before the hack. Restoring an infected backup reintroduces the malware.

• iPhone: Settings > General > Transfer or Reset iPhone > Erase All Content and Settings
• Android: Settings > About Phone > Factory Reset > Erase All Data

How to prevent your phone from being hacked

Once you've secured your phone, keep it that way.

• Keep your OS and apps updated. Most attacks exploit known vulnerabilities in outdated software.
• Only install apps from official stores. Avoid sideloading, especially from unfamiliar sources on Android.
• Enable a strong lock screen PIN or passphrase. Use a six-digit or longer code, or an alphanumeric passphrase.
• Use a VPN on public Wi-Fi. A reputable VPN encrypts your traffic and prevents snooping on unsecured networks.
• Turn off Bluetooth and Wi-Fi when not in use. These can be exploited as attack vectors in public spaces.
• Be skeptical of unexpected messages. Don't click links in texts or emails you weren't expecting.
• Review app permissions regularly. Apps shouldn't need mic or camera access unless they're actively using those features.
• Use an authenticator app instead of SMS for 2FA. SMS codes can be intercepted via SIM swapping.
• Enable Find My (iPhone) or Find My Device (Android). If your phone is stolen, you'll need this to wipe it remotely.
• Consider a mobile security app. Especially on Android, a trusted security solution provides real-time protection against malware, phishing links, and suspicious activity.

For high-risk users (journalists, executives, activists), iPhone's Lockdown Mode (Settings > Privacy & Security > Lockdown Mode) drastically limits the attack surface. It's extreme, but for those who need it, it's a strict layer of protection.

Quick reference: signs, causes, and fixes

Conclusion

Your phone is a treasure chest for cybercriminals, and attacks are growing more sophisticated every year. The good news is that the vast majority of phone hacks don't require advanced technical skills to detect or fix. Most come down to suspicious apps, phishing links, or unsecured settings, all of which are correctable once you know what to look for.

Start with the basics: stay updated, be selective about apps and permissions, and treat unexpected messages with healthy skepticism. If something feels off, trust your gut and investigate immediately. The sooner you act, the less damage gets done.

Get a free security scan with Guardio today and stay protected from phishing sites and malicious links on your phone.