How to check if someone is spying on your phone: Simple signs every user should know in 2026

Battery drains very fast even when you are not using the phone

Phone heats up without heavy usage or apps running

Unknown apps appear that you did not install

Data usage increases suddenly without reason

Strange pop ups or ads keep showing on screen

Calls or messages are sent without your knowledge

Phone becomes slow or starts lagging randomly

Unusual background noises during calls