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Indoor Mobile Phone Signal Booster

Do you struggle to maintain a mobile phone signal in your home or office? Does your mobile phone line break up during an important phone call?

Finally, there is a solution for poor signal strength at home and the office. Cel-Fi’s mobile phone signal booster strengthens your signal indoors by up to four times, providing clear voice conversations and greater data throughput- there’s no need to restrict your mobile conversations to outside. Available in the RS2 and the PRO, Nextivity offers legal mobile phone signal boosters for 3G, 4G and LTE voice and data for four of the main UK mobile networks: Three, O2, Vodafone and EE (this box covers T Mobile and Orange also).

Ready for Cel-Fi? Choose your network:

Strengthen Indoor Signal

Cel-Fi is designed to improve indoor mobile phone signal for 3G and 4G users. It creates a large coverage bubble of improved signal that automatically adjusts to the size of the building – making it ideal for homes and Small-to-Medium businesses.

Easy Installation

Cel-Fi units use simple plug-in and play technology! One unit sits near to your window to pick up signal, and the other sits in the centre of the building. An intuitive indicator helps locate the optimum distance between the window unit and the coverage unit for the best signal range.

Reduce Dropped Calls

With increased connectivity to your 3G and 4G data, you can ensure improved voice clarity, reduced dropped calls and faster data transfer rates when downloading videos, photos, emails and data to your smartphone.

How it works

  • The fully wireless system works by placing the Window Unit in the area of the building with the strongest signal (normally on a window sill).
  • It takes this signal, as little as 1 bar, and amplifies it to up to 5 bars.
  • The Coverage Unit is then placed a reasonable distance apart (normally in the centre of the building) and works to create a bubble of stronger signal distributed across approximately 13,000 sq ft.
  • The system works wirelessly with all phones that operate with 3G or 4G signal – there is no need for an internet connection or to pair your device with the Cel-Fi unit.


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