Cel-Fi is Nextivity’s brand of self-configuring, environmentally aware, indoor coverage solutions. Each Cel-Fi system consists of two units. The Network Unit is placed in the area where the strongest native signal can be received from the carrier network (signal levels as low as -120 dBm are acceptable). The Network Unit comprises a transmitter and receiver which communicates with the cell tower. The Coverage Unit is placed in the centre of the home, communicates wirelessly with the Network Unit and “lights up” the interior of the house with significantly enhanced signal levels, thus enabling better quality calls and greater data throughput.

Yes Cel-Fi is legal. Cel-fi products are licence-exempt and fully comply with Ofcom's UK Interface requirement 2101 (IR2102) (UK) and ComReg S.I.No.283 of 2018 (Ireland).

Mobile operators have historically adopted an extremely strict policy against the use of user-installed mobile phone signal repeaters and boosters on their networks as they caused interference and damage to the performance of the networks. It is for this reason that Ofcom consider many mobile signal repeaters as illegal. Due to its unique intelligent features, Cel-Fi is the only user-installable legal mobile phone repeater permitted in the UK.

We have Cel-Fi units available for EE, O2, Three or Vodafone. However, within these networks there are also Mobile Virtual Network Operators (MVNOs). Please check our Networks page for list of the most common MVNOs, the operator they use and our compatible boosters. Note that MVNOs may occasionally change their host network. If this happens, please contact us about reconfiguring your Cel-Fi unit. Please also note that network operators have the right to shut down your system at any time, without notice.

Yes, the Cel-Fi QUATRA 4000e is a multi-operator repeater. A single Cel-Fi QUATRA 4000e network unit has the ability to boost up to four networks simultaneously. Whilst it is possible to reconfigure the operator on other Cel-Fi systems, they can only ever boost a single network at one time.

No. The Cel-Fi system only needs to have at least 1 bar of native cellular signal, in at least one spot of your home to be able to cover your whole home or office space.