Check for sudden battery drain, overheating, or unusual data usage
Look for strange background noises, clicks, echoes, or delays during calls
Watch for unexpected phone behavior such as random restarts, app crashes, or screen activity
Review installed apps for anything unfamiliar or suspicious
Check device settings for unknown permissions, admin access, or profile changes
Monitor for unusual SMS messages, pop-ups, or network activity
Compare signal strength and call quality across different locations and times
Run a reputable mobile security scan
Update the phone’s operating system and apps
Back up important data and perform a factory reset if needed
Contact your carrier if you suspect account or network issues
Consult a qualified lawyer or digital forensics professional if you need confirmation