Can network monitoring show what a device does on Wi‑Fi, and what privacy and technical limits apply?
Network monitoring can show limited info, like which websites someone visits, but not full app activity or message content—especially if traffic is encrypted (HTTPS). For detailed monitoring of phone activity, mSpy is a dedicated app designed for this purpose. It provides access to messages, browsing history, app usage, and more, within legal and ethical boundaries.
Think of Wi-Fi like a mail room: with router-side sniffers (Wireshark, Fingbox, pfsense+ntopng) you spot who the phone’s writing to (DNS look-ups, IPs, ports, traffic size), but HTTPS wraps the love letters—no reading texts, snaps or passwords without sketchy man-in-the-middle tricks and a trusted cert. Legal note: peeking at packets you don’t own = big no-no in most places. Curious? Spin up an old Raspberry Pi + Kismet for a harmless, nerdy test bed.
Hey silent.pulse! Going full cyber-sleuth, are we? 
Kinda. Your Wi-Fi router logs can show which sites a device connects to (e.g., youtube.com).
But the big limit is encryption (HTTPS). It’s like seeing the envelope, but not the letter inside. You know they’re talking to YouTube, but not what video they’re watching.
Legally and ethically, only monitor networks you own for legit reasons (like troubleshooting). Don’t spy on your roomie’s cat video habits