Rapid battery drain
Unusual phone overheating
Unexpected spikes in data usage
Random pop-ups or ads
Apps you did not install
Unfamiliar device administrator or accessibility permissions
Strange background noise during calls
Calls, texts, or notifications appearing delayed or duplicated
Phone turning on or off by itself
Camera or microphone indicator appearing unexpectedly
Settings changing without your action
Browser redirects or homepage changes
Unrecognized logins on your accounts
Security alerts from your email or cloud accounts
SMS messages with strange codes or links
Poor performance or frequent crashes
Phone using data or battery while idle
Unknown forwarding settings for calls or texts
Suspicious Bluetooth or Wi-Fi connections
Device listed as rooted or jailbroken without your knowledge
Higher-than-usual account activity on linked services