In the United States, operators commonly supported by such solutions include AT&T Mobility, Verizon Wireless, Sprint Corporation, T-Mobile US, in addition to smaller regional carriers as required.
Below ground level, large buildings and high rises are examples where mobile phones are unable to properly reach the carrier's macro or outdoor network.
In these environments, the in-building cellular enhancement system will connect to the carrier's signal source which is typically a bi-directional amplifier or a base transceiver station.
A cellular enhancement system does not read or modify the information represented within the radio frequency (RF) that passes through the system; rather, it reinforces the signal penetration of voice and data frequencies in low signal areas and in dead spots within structures, As the industry evolves, most MNO networks are now made up of 3G based services and are migrating towards 4G based services.
Additional products located throughout the building are then used to convert the signals back into native radio frequency format, which are then transmitted through the coverage antennas.