Phones hold our banking apps, private messages, photos and work email, so the idea that someone else might be inside yours is unsettling. The good news is that genuine phone hacks are less common than people fear, and most warning signs have ordinary explanations. The bad news is that when a phone really is compromised, the damage can spread quickly to your email, bank and social accounts. Learning the real signs your phone has been hacked means you can act fast when it matters.
This guide walks through the most common signs of a hacked phone, explains which ones actually matter, and gives a clear, step-by-step plan for securing an Android phone or iPhone.
How Phones Usually Get Compromised
Understanding how attackers get in makes the warning signs easier to read. Most compromises on everyday phones come from a small number of routes:
- Phishing links sent by text, WhatsApp or email that lead to fake login pages for your bank, Apple account or Google account.
- Malicious apps, usually sideloaded from outside the official app stores, or disguised as free versions of paid apps.
- Stolen account passwords reused across several sites, which let someone sign in to your cloud account and see your phone’s data without touching the device itself.
- SIM swap fraud, where a criminal convinces your mobile network to move your number to a new SIM so they receive your security codes.
- Physical access, such as a partner or acquaintance who knows your passcode and installs monitoring software.
Highly targeted spyware used against journalists and politicians does exist, but it is rare and expensive. For most people, the realistic risk is a phishing link, a dodgy app or a reused password.
Signs Your Phone Has Been Hacked That Deserve Attention
1. Account activity you do not recognise
This is the strongest signal of all. Password reset emails you did not request, sign-in alerts from unfamiliar locations, sent messages you did not write, or posts on your social media that are not yours suggest someone has access to an account, if not the phone itself.
2. Apps you did not install
Scroll through your full app list, not just your home screen. An unfamiliar app, especially one with a generic name like “System Service” or “Device Health”, deserves a closer look. On Android, also check which apps have been granted accessibility access or device administrator rights, because malware often asks for these.
3. Texts and calls you did not make
Check your call log and your bill. Premium-rate texts or international calls you never made can point to malware that sends messages in the background to earn money for the attacker.
4. Losing mobile signal for no reason
If your phone suddenly shows “No Service” or “SOS only” in an area where it normally works, and the problem persists after a restart, contact your network immediately. This is a classic sign of a SIM swap, and acting within minutes can stop someone from intercepting your bank codes.
5. Pop-ups and browser redirects
Constant pop-up adverts outside of apps, or a browser that keeps redirecting to strange sites, often indicates adware. It is more annoying than dangerous on its own, but it shows something unwanted has been installed.
Signs That Usually Have Innocent Explanations
Plenty of online checklists treat every quirk as proof of hacking. In reality, these symptoms are far more often caused by normal software behaviour:
| Symptom | More likely cause | When to worry |
|---|---|---|
| Battery draining faster | Ageing battery, a recent update, or a heavy app like maps or video | A single unknown app tops the battery usage list |
| Phone running hot | Charging, gaming, poor signal or hot weather | It is hot while idle and the screen is off |
| Higher data use | Automatic backups, app updates or video streaming | An app you rarely open is using large amounts of data |
| Slow performance | Low storage or an older phone | It started suddenly alongside other warning signs |
The useful habit is to look for a pattern. One symptom alone rarely means much. Several symptoms that started around the same time, especially alongside account alerts, deserve action.
What to Do If You Think Your Phone Is Hacked
Work through these steps in order. The first few protect your money and accounts, which matter more than the device itself.
- Secure your email first. From a different, trusted device, change the password for your main email account and sign out of all other sessions. Email is the key to resetting almost every other account.
- Call your bank if money could be at risk. Use the number on the back of your card, not one from a text or email. Banks can freeze cards and flag suspicious payments.
- Change passwords on important accounts, starting with banking, Apple or Google, and social media. Use a different password for each one.
- Turn on two-factor authentication or passkeys. An authenticator app or passkey is much harder to steal than a text message code. Our guide to passkeys explained shows how to set one up.
- Remove suspicious apps. Uninstall anything you do not recognise. On Android, revoke device administrator or accessibility permissions first if the app will not uninstall.
- Update your phone. Install the latest operating system and app updates, which close security holes attackers rely on.
- Run a security scan. On Android, make sure Google Play Protect is switched on and run a scan from the Play Store. Apple does not allow traditional antivirus apps, so updating iOS and removing unknown profiles is the main step on iPhone.
- Check for configuration profiles on iPhone. Go to Settings, General, VPN and Device Management. Remove any profile you did not knowingly install, unless it belongs to your employer.
When a Factory Reset Makes Sense
If problems continue after the steps above, a factory reset is the most reliable fix. It wipes everything, including any hidden malware. Back up your photos and important files first, but avoid restoring a full app backup straight away, because you could bring the problem back. Reinstall apps manually from the official store instead.
A reset will not help if the real problem is a compromised account. That is why securing your email and passwords comes first.
How to Prevent It Happening Again
- Only install apps from the Google Play Store or Apple App Store, and check reviews and the developer name before downloading.
- Never tap links in unexpected texts about parcels, refunds or account problems. Open the official app or website yourself instead.
- Use a password manager so every account has a unique password.
- Set a strong passcode of at least six digits, and do not share it.
- Ask your mobile network about extra security on your account, such as a PIN required before any SIM change.
- Keep automatic updates switched on.
In the UK, you can forward scam texts free of charge to 7726, which helps networks block the numbers sending them. The UK’s National Cyber Security Centre also publishes free guidance on securing your devices and accounts.
Frequently Asked Questions
Can someone hack my phone just by calling me?
For ordinary users, answering a call does not install malware. The risk on calls is social engineering, where someone pretends to be your bank and talks you into sharing codes or moving money.
Can an iPhone be hacked?
Yes, although it is less common than on Android because of Apple’s app store controls. Most iPhone compromises happen through stolen Apple account passwords or phishing rather than malware on the device itself.
Will turning my phone off and on remove a hacker?
A restart can stop some temporary threats, and it is a sensible first step. It will not fix a compromised account or remove an installed malicious app, so follow the full checklist above.
The Bottom Line
Most strange phone behaviour has a boring explanation, but account alerts, unknown apps and sudden loss of signal should never be ignored. If you suspect a problem, protect your email and bank first, then clean up the device. A few habits, such as unique passwords, two-factor authentication and avoiding links in unexpected messages, will stop the vast majority of attacks before they start. Keep this list of signs your phone has been hacked handy so you can check it quickly if something feels wrong.
