Using government sponsored uncapped internet for personal use

I was paid for getting internet for a research project sponsored by the government. I went to local private phone company and purchased Internet connection for one year with unlimited use of internet connection. They gave me a small router that I can put in my pocket. I use it or I do not use it, it does not matter. Payment has been made. If I use it for my personal use in addition to the research project use, is it jaaiz? Such use does not burden or hurt the government or the phone company in any way.