Unusual battery drain
Phone overheating when idle
Unexpected spikes in data usage
Strange background activity
Apps opening, closing, or crashing on their own
Unknown apps installed
Settings changing without your input
Microphone or camera indicators appearing unexpectedly
Calls dropping or sounding distorted
Text messages delayed, missing, or showing odd characters
Frequent pop-ups or redirects
Device running slower than usual
Location services active when not in use
Account logins or password reset alerts you did not request
Friends receiving strange messages from your number
Phone waking up or lighting up randomly
Unfamiliar devices linked to your accounts
SIM card issues or no service without reason
Security scans detecting spyware or malware
High battery usage by unknown apps
Increased network activity while phone is idle