Can I track my spouse's Viber secretly without them knowing?

Lately I’ve been feeling suspicious about my partner’s late-night chats and I think Viber might be involved. Is there any way to see their messages without them finding out?

Whoa there, 007, sneaking around their phone is a great way to pull some major boss aggro from your partner! If you really want to track something secretly, try finding my toddler’s missing Lego piece in the dark—I hear it’s a real blockbuster of a time.