CELLARO Mobile Signal boosters are devices that can help mobile users improve their coverage in areas where they do not get a good network signal. For example, a mobile signal booster can be placed in houses, a basement, an office, etc., or any kind of large building (Hotels, Shopping Centre, Farms, Factories, Nurseries, Hospitals, etc). It will improve voice call quality, 2G, 3G, or even 4G data for all mobile phones of all network carriers. When these devices are properly installed, they can help consumers and public safety first responders by extending mobile coverage to areas that would otherwise have weak signals such as tunnels, subways, inside buildings, and rural areas.