[NY] I suspect my school is using signal jammer.

Hi. I'm a student at a boarding school. It has been 3 days since the phone signal works inside the building but a few yard outside the building the phone service works. The same circumstances applies to every person in the building. I know that signal jammer is illegal but i couldnt obtain any prove that signal jammer is being used. How should i reach out to the authorities? Should i get a lawyer? If yes, how much would a lawyer cost as i have a limited budget. Thank you.