Our shop has absolutely no cell phone reception inside but outside on west wall we have 3-4 bars and phone works great. Was thinking about a booster repeater but don't have a clue if they truly work. Shop is 40 x 50 metal building with roof insulated only. Anyone on here done this and were you satisfied? Phone is Verizon and 4g service. I hope I have given enough information for some possible ideas.

Thanks for any information or tips you may have.