Check for sudden battery drain
Check for unusual data usage
Check for overheating when idle
Check for unknown apps installed
Check for apps asking for strange permissions
Check for pop-ups or ads appearing outside browsers
Check for calls, texts, or emails you did not send
Check for unfamiliar logins on your accounts
Check for settings changed without your action
Check for microphone, camera, or location indicators turning on unexpectedly
Check for phone slowing down or crashing often
Check for high background activity in battery or data settings
Check for browser redirects or homepage changes
Check for security alerts from your accounts
Check for unknown device admin apps or accessibility services enabled
Check for unrecognized Bluetooth or Wi-Fi connections
Check for forwarded calls or messages you did not set
Check for SIM issues like no service or unexpected carrier changes
Check for antivirus or security app warnings
Check for rooted or jailbroken status if you did not do it
Check for factory reset protection or account recovery changes you did not make