Affiliate Marketing Secrets

I know they can track the sites I visit and time spent and all that jazz when I am on my desktop work PC but can they do something similar when I browse sites on my own personal, non-work affiliated smartphone – while I am at work that is.
So if I browse job sites on my smartphone when I am at my desk, will they be able to detect that?

I am apperently bullying this girl because one of my friends wrote ***** on her desk and she got me suspended then she got scared I would tell the school she has a gun on her because she had toold me b4 when we were friends so while I was expelled she said I bring a knife to school and then got her friends to testify and they checked me and my locker and found nothing but are still investigating wtf idk what to say there als was a rumor goin around about me being in a gang or affiliated whatever they like to call it but they confirmed it not to be true and idk what to do I mean I got my friends to say I have not ever owned one but do they have anything?