how do I stop the updates and downloads when at work?

[AC Question]

I work at a remote site for 4 weeks with a small bandwith, they do not allow downloading or updating as it uses too much bandwith. I would like to stop my cell and tablet from attempting to do these things while I'm there. I get blocked from using the net because they are trying to update or download things they need. I can update/download later when I'm home. Both are androids and the tablet has windows 10.