If you need a fallout shelter hack tool then you should know where to look for it as there are several ways that you could proceed especially if you have access to the internet as you can get almost all games hacks tools online. If you are desperately looking for one then it may be helpful to check with a colleague who might be used to obtaining such hacks so they can recommend you the most appropriate solution for your needs especially if they know of a particular website that gives away such hack tools which you could use to your advantage.
In fact, if they already have access to a fallout shelter hack tool then they could simply pass it over to you and you could use it as well provided that the hack tool can be used on multiple devices at the same time. Otherwise, if you have no idea about such a colleague or if you would like to keep these things to yourself then you could always Google and look up websites that can provide these to you.
But you will have to exercise caution as not every website that claims to offer a fallout shelter hack tool would indeed have access to such a tool. It would be helpful if you could spend some time researching and comparing offers on different websites and trying them out in your free time to see which ones would be worth bookmarking for further investigation and possible use.