In my view, the above question is quite pointless, as well as the answer can vary. As well as the question is so simple that common sense can answer it (ask the boss of your office), and assuming that any scholar would have or has ever answered such a question or a similar one, it would mean the question shows very low research effort.
I believe it should be closed, but not sure as what. Should it be closed as Unclear, too broad, or as off-topic? or is it possible for the question to be salvaged?
Similar questions (the problems I see in them can be covered by what I said above):
Is it Haram or Makruh to use the office's phone (without the permission of the boss) to talk with our family? (Shia view)
According to Shia Islam, is it permissible to speak by mobile phone during the time of working?
It is Haram to use your cellphone at your office during your work time? (Sunni View)