Our phones contain our bank apps, private chats, photos, and personal documents, which makes them a favourite target for hackers and scammers. The scary part is that a compromised phone often does not show any clear message — it just starts behaving strangely. In this article, we explain nine warning signs that your phone may be hacked or infected, and what you should do if you notice them.
1. Battery Drains Much Faster Than Before
If your phone’s battery suddenly starts finishing much earlier than usual, without any change in your usage, it can be a sign of hidden malicious software running in the background. Spyware and other harmful apps constantly collect data and send it to a server, which uses a lot of power. First check Settings > Battery > Battery Usage to see if an unknown app is using heavy power.
2. Phone Becomes Hot Without Heavy Use
A phone normally becomes warm while gaming or charging. But if it feels hot while simply lying on the table, something may be running non-stop in the background, like a hidden mining or spying process. Continuous heating along with battery drain is a combination you should not ignore.
3. Mobile Data Finishes Unusually Fast
Malicious apps send your data — photos, messages, location — to the hacker’s server, which consumes your internet pack. If your daily data starts getting exhausted much earlier than before, and your own usage has not changed, check the data usage section in settings to find which app is responsible.
4. Unknown Apps You Never Installed
Go through your app list carefully. If you find apps that you are sure you never installed, it is a serious warning sign. Harmful apps sometimes install silently through fake links or bundled with other apps. Uninstall any app you do not recognise, especially if it has a blank or generic icon and name.
5. Strange Pop-Ups and Ads Everywhere
Seeing ads inside some free apps is normal. But if full-screen pop-up ads appear on your home screen, inside other apps, or even when you are not using any app, your phone is likely infected with adware. These ads often try to push you to fake prize pages and scam websites.
6. Friends Receive Strange Messages from You
If your friends or family tell you that they received odd links or money requests from your WhatsApp, SMS, or social media accounts, your account may be compromised. This is one of the clearest signs, and you should act immediately — change passwords and turn on two-step verification on those accounts.
7. Phone Behaves on Its Own
Apps opening by themselves, settings changing without you touching them, calls or messages you never made in your history, or the camera and microphone indicator turning on for no reason — all of these point towards someone else having control or access to your device.
8. Passwords Stop Working
If you suddenly cannot log in to your email or social media account with the correct password, it may mean someone changed it after gaining access. Use the “Forgot password” option from a safe device, recover the account quickly, and check its recent login activity.
9. OTPs and Alerts for Logins You Never Tried
Receiving an OTP for a login you did not attempt means someone has your password or number and is trying to get in. Never share that OTP with anyone. Change the account password immediately and review its security settings.
What to Do If You Notice These Signs
- Run a scan using Google Play Protect from the Play Store, and uninstall any app it flags or that you do not recognise.
- Change passwords of important accounts — email, banking, and social media — and turn on two-step verification everywhere.
- Update your phone software and all apps, because updates fix security holes.
- Remove permissions like Accessibility and Device Admin from suspicious apps in settings.
- If the problem continues, back up only your photos and important files, then do a factory reset and install apps again only from the Play Store.
- If money is involved or fraud has happened, call the cyber helpline 1930 and inform your bank right away.
Most phone hacking happens through careless clicks, fake apps, and shared OTPs — all of which can be avoided. Stay alert to these warning signs, install apps only from the Play Store, and keep your software updated. A careful user is far harder to hack than any software alone can protect.