Business Cell Phone Service Coverage in our buildings is non-existent. If we are outside the building we can get cell service for a couple of cell phone providers. We are a rural school district and looking for a unit that we can put in our building to give us good signal inside. We used a Verizon 4G LTE Network Extender this last year but it stopped working and only worked for those that had Verizon as their service provider. Does anyone know of a model that is reliable and covers most service providers as long as we have a good GPS signal? We have our old one....that stopped working.....connected to our network.