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Number 2. Your Phone is responding very slowly.
Malicious apps tend to encroach on your data and feed it to the hackers who have made the app. This hogs the processing power of your smartphone and as such, your device starts slowing down.
Number 3. Suspicious notifications from banks or other services.
If you start getting messages that seem to be from your bank or other services that you have subscribed to in person, there is a good risk that your smartphone has a virus or malware that is feeding on personal data in real-time.
