In what way? Morally and ethically, I think you're going to get a resounding yes from people here. Legally, I very much doubt it, but I am not a lawyer.
Legally. In my opinion, if something is required for a worker to finish the job, the employer is obligated to provide it for free. I could be wrong. Curious to know other people's thought.
I’m not sure what the laws are, but it would seem pretty silly to fire an engineer over the cost of a device like this. Of course it is important that you don’t have a cellphone, from your employer’s point of view.
Or “I don’t bring it to work, I want to focus on your issues 100% no distractions, boss :)”