[CelticSquirrel]

I'm not sure exactly what is going on, but I feel like I'm going crazy. Searches I never did are showing up in history, or even when I open browser, it's a page I never went to. Things are changing all over my phone. Notes, documents, pictures, settings.

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Did you really need to make three topics?

 

Surely if you're being spied on then due to the nature of spying such searches and settings would not be changing. I doubt you're being spied specifically, there may be something else however.

[rainyXP]

Did you really need to make three topics?

 

Surely if you're being spied on then due to the nature of spying such searches and settings would not be changing. I doubt you're being spied specifically, there may be something else however.

[buzzware]

Best possible way would be take take backup of documents, photos, videos, logs, files etc and factory reset the iphone.

[Farie977]

Did you have your iPhone 6S plus connected to a computer like a Mac? So far I know, Apple IDs would sync almost anything like pictures, Safari searches, musics, etc.
It's almost the same like Google accounts.