Spy apps can steal all your mobile information and drain your batteries. If your battery is draining faster than usual, your data has been draining really quickly or your phone is getting slower than before, it means a spy app has attacked your phone. Weird texts appearing on your phone and random applications appearing are also strong indicators of spy apps.
If you want to keep away from spy apps, stay away from apps from unknown sources and go for a factory reset after having a back up of your info.
The below infographic to identify if your phone has a hidden spy app and how to get rid of it
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