Two different worries
"Watching the network" means seeing which sites and apps your phone connects to, from the Wi‑Fi, the carrier or anyone they share with. "Watching the phone" means software inside it that reads messages, listens or tracks location. The first is normal and happens everywhere; the second is rare and needs access to the device.
What a network or carrier can see
Site names and servers, times, amounts of data, and your public address. Not the contents of WhatsApp, Signal, Telegram or any HTTPS app; those are encrypted end to end or in transit. SMS and ordinary phone calls are not encrypted on the network and can be read or recorded by the carrier.
A VPN changes this picture: the network and the carrier see one encrypted connection to a VPN server and nothing about the sites behind it. Teal VPN does this in one tap and keeps no log of the sites you visit.
Signs that mean something
An app you did not install, especially one with accessibility or device-admin rights. Battery that drains much faster than before with the screen off. Mobile data used by an app you do not recognise. Settings that changed by themselves, like an unknown "Private DNS" or a VPN profile you never added. A "device management" or "work profile" entry on a personal phone.
Signs that mean nothing
Clicks or echo on calls, a warm phone, ads that match something you said out loud, a battery that ages. These are network quality, normal heat, ad targeting from your searches and app activity, and chemistry. They are not evidence of monitoring.
How to check the phone
Android: Settings, Apps, show all apps; then Settings, Security, device admin apps; then Accessibility, installed services. Remove anything you do not know. iPhone: Settings, General, VPN & Device Management, remove unknown profiles. On both: update the system, set a lock the other person does not know, check which Google or Apple account is signed in, and turn off "install unknown apps" for browsers.
If someone with access to you may have installed something, a factory reset after backing up photos is the clean answer. If you fear for your safety, do this with someone you trust and consider a new phone.
What reduces the risk every day
Updates on. A screen lock. Apps only from the official store. Encrypted messengers instead of SMS. Two-factor on the main account. A VPN on networks you do not control, so the Wi‑Fi and the carrier see nothing of your browsing.
Keep reading
References
- Google: Remove unknown apps and device admin on Android
- Apple: About profiles and device management on iPhone
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