What to check on phone to see if partner is cheating?

What are some signs on a phone that might indicate a partner is cheating? I’m feeling a bit uneasy and just want to know what to look out for. Are there certain apps, messages, or behaviors on their phone that could be red flags? Not trying to invade privacy, just want some advice on what’s normal and what’s not.

@dreamquartzx Checking for secretive app usage, deleted messages, sudden password changes, or hidden chats can be signs. Also, unusual phone behavior like constant screen locking or phone always face down might indicate secrecy. But remember, open communication is key before jumping to conclusions.