Support and FAQs
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Cel-Fi consists of two units: the Window Unit (WU), and the Coverage Unit (CU). Users place the WU in an area with the strongest signal from the mobile network. The CU is then either placed in the centre of the home or office, or in the area where the best signal quality is most needed. The two units communicate wirelessly with one another enabling the CU to effectively produce a 'bubble of quality signal' throughout the home or office, resulting in significantly better voice quality and greater data throughput. The WU and the CU are placed at varying distances apart, but in general an indoor distance of up to 20-30 metres is common.
Yes. Cel-Fi’s mobile signal booster is specifically designed to improve indoor signal for between 20 and 30 metre radius within the building, making it ideal for homes and SME businesses.
Yes Cel Fi is legal. It is regulated by Ofcom and it has also been approved by certain networks. In the UK (and several other countries) Cel-Fi devices are ultimately under the control of the mobile networks, i.e. the network has the ability to disable Cel-Fi devices in a particular area, without any user input
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.
A mobile signal repeater is a radio device that works to boost mobile network coverage for users. They amplify frequencies from mobile network providers via reception antennas. All radio devices must meet regulations set out by Ofcom. These mobile phone signal repeaters are commonly known for interfering with mobile providers and as a result, Ofcom does not licence any signal repeater in the UK, making them an illegal technology.
Cel-Fi’s technology is more advanced, allowing mobile network providers the ability to monitor and regulate the use of Cel-Fi units themselves. For this reason, they classify as a Smart repeater and are considered a legal mobile phone repeater in the UK.
Cel-Fi UK currently has two models available for purchase; the RS2 model and the latest PRO model that joined the portfolio in early 2015. Both models work to boost indoor mobile signal for home and office use.
The RS2 works to boost 3G voice and data and is deployed in the UK with a configuration that allows the mobile operator whose network it is configured for to turn it off by setting particular parameters in the network.
The PRO works in the same way as the RS2, however, the box itself is more compact. It has a screen that allows the user to monitor the programming more and also supports 4G data as well as 3G voice and data.
An earlier model that is no longer supplied in the UK was the RS1. The RS1 had a lower capacity than the RS2 (RS2 has 3x the radio capacity) and was deployed to a limited extent by T-Mobile UK (now known as EE) and in small amounts by O2 UK.
In all other respects, the three models are the same. They are locked to a particular network, only boost that network’s radio frequencies and implement hardware and software algorithms that completely protect the network from the harmful effects usually associated with repeater products.
The Cel-Fi RS218 unit does all that the RS2 can, however, it uses a different band of data with less traffic in than the RS2 and therefore can be more suitable than the RS2 for rural areas that have issues with their signal. If you live in a rural area and are interested in finding out if the RS218 could benefit you, please call 0845 618 7249 to speak to one of our advisors.
The Cel-Fi RS2 supports 3G voice and data whilst the most current version, Cel-Fi Pro, also supports 4G and LTE data.
So is the Cel-FI RS2 Signal booster safe? We actually test the Cel-Fi units like a phone for a SAR rating. Anything with a SAR rating of less than 2.0 is defined as 'touch safe'. Both the Cel-fi window unit and coverage unit have a SAR rating below 2.0.
Technically measuring SAR is usually only done for hand-held or body worn devices so WiFi routers generally don't have SAR ratings. In any case the power we emit is no greater in general than other consumer wireless networking devices and smart phones.
The range of the Cel-Fi RS2 depends on building construction; we quote 20-30 metre radius as standard, but it can be smaller or wider depending on:
- the building construction
- strength of the signal at the Window Unit and
- physical separation of the Window Unit and Coverage unit (more separation = more boost)
There is no limit to the number of devices that can be attached to the network via Cel-Fi. The number of calls the unit can support depends on how far away it is from the serving base station (shown by the number of coverage bars on the display of the Cel-Fi Window Unit). Where the coverage is weak (1 or 2 bars on the Cel-Fi Window Unit) the unit may support as little as 3-6 calls. Where the coverage is good (4 or 5 bars on the Cel-Fi Window Unit) the unit can support 20 calls or more.
The amount of coverage you get with one unit differs for every building and can be influenced by a variety of different factors e.g. thickness of walls. We recommend that you start with purchasing just one Cel-Fi unit for your building and see how this works for you. If you would like to discuss your requirements in further detail, prior to purchasing, please call 0845 618 7249 to speak to one of our advisors.
Certain building materials can affect the coverage of the unit. Older buildings tend to use more materials and have thicker walls and therefore radius coverage can be reduced. If you would like to discuss a particular material in further detail with one of our advisors, please call 0845 618 7249.
Cel-Fi has tested two units working together correctly within the same radius. Cel-Fi cannot guarantee that loss of performance or network interference will not occur if more than two units are used together within the same radius.
It measures approximately 2m in length.
We have RS2 and Pro units available for Three, EE or O2. However, within these networks there are also Mobile Virtual Network Operators. Please see the additional networks these units can support below:
|Mobile Virtual Network Operators||
Please 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.
Cel-Fi is authorised for use by 137 mobile operators around the world. Of the world’s top 20 mobile operators, 13 have either implemented or are testing Cel-Fi. Cel-Fi UK only sell signal boosters configured to UK based networks. Other worldwide networks are available for a range of other countries; however, if a mobile network is not offered by Cel-Fi, the network is not available for purchase.
No, Cel-Fi products do not require network activation or provisioning.
No, Cel-Fi does not require maintenance, and it will automatically adjust to changing cellular network situations.
Remove and discard the SD cards, then update the Cel-Fi device to the latest operating software and configuration for EE: go to http://cel-fi.com/ee-upgrade and follow the instructions.
Yes. Each Cel-Fi system is customised to work on an individual operator network.
Cel-Fi units can be reconfigured by Nextivity from the network the unit is programmed to. A fee will be charged to do so.
No. Cel-Fi is configured to one network at one time. Whilst it is possible to reconfigure the network on your Cel-Fi system, you will only ever be able to boost one network at one time.
Cel-Fi RS2 will only improve the 3G signal and it's not 4G LTE compatible. It's worth mentioning that 4G is currently a 'data only' service, i.e. for Internet, downloads, video streaming etc. - the moment you make a phone call, your phone will revert to 3G (or even 2G) to make the call.
Yes! All iPad and iPhone versions are supported by Cel-Fi systems sold on this web site.
Cel-Fi units are not only set to particular frequencies, but they are locked to the network identity (referred to as the 'PLMN-ID'). Therefore Cel-Fi devices typically only work for the particular country and network they are sold to. Only Nextivity can create the configuration for any given network.
Cel-Fi offer various configurations for a range of EU networks. To find out if we can support you, call one of our advisors on 0845 618 7249.
The Cel-Fi's IntelliBoost Baseband Processor is the first core processor designed specifically to optimise the indoor transmission and reception of 3G, 4G and LTE wireless signals. With advanced filtering, equalization and echo cancellation techniques, Nextivity has developed an embedded architecture which delivers unprecedented in-building data rates and pervasive 3G, 4G and LTE connectivity. The IntelliBoost processor ensures that Cel-Fi products never negatively impact the macro network while providing maximum coverage. By continuously monitoring the gain and making real-time adjustments, the system will never overdrive the base station or raise the noise floor.
Cel-Fi uses channels from both the U-NII-1 (either 5.15-5.25 GHz OR 5.25-5.35GHz) and the U-NII-2 block (5.47-5.725 GHz) to communicate between the Window Unit and the Coverage Unit.
Cel-Fi utilises an intelligent processor to actively adjust to the network environment. It uses multiple techniques including automatic gain control, real-time path loss analysis, and uplink signal gating to ensure that it never degrades the quality of the macro network signal or artificially raises the noise floor of the node B.
Mobile phone signal repeaters are classified as radio devices. They work to boost mobile phone signal, however, they can interfere with mobile operator networks and therefore are considered illegal as laid out by Ofcom.
Cel-Fi is different in that it is considered a smart repeater under the criteria set by Ofcom. A Smart Repeater (or Femtocell) is a mobile phone signal booster that is connected to a particular operator network and allows the host mobile network to fully monitor and control the device. Unlike, mobile phone signal repeaters, smart repeaters do not interfere with the mobile network’s coverage and are therefore considered a legal mobile signal booster. As a result, mobile network providers are beginning to work directly with these devices to offer them to users for improved indoor signal coverage.
Cel-Fi relies on intelligent, self-organising algorithms to maximise the area of coverage for users while ensuring that it does not compromise or interfere with mobile operator networks or impede other subscribers' signals. Cel-Fi does not require any new equipment or changes to existing network infrastructure, or mobile devices. Recognised for its superior design and effectiveness, Cel-Fi is the only consumer mobile signal booster authorised and approved by the communications commissions in Australia and the United Kingdom, and the first consumer mobile signal booster fully compliant with the new Report and Order for signal boosters as defined by the Federal Communications Commission (FCC) in the USA, effective from March 2014.
|Coverage Unit Shows Value of '0'||The coverage unit is too close to the window unit||Move the coverage unit further away from the window unit|
|E4||Window unit is overheating||Make sure the vents on the unit are not blocked. Move the unit to a cooler area. The system will start working normally when it cools down|
|E3||Coverage Unit is overheating||Make sure that the vents on the unit are not blocked. Move the unit to a cooler area. The system will start working normally when it cools down.|
|E1||No signal on the Window Unit||Try moving the window unit to another room or area where you have coverage. (use your mobile phone to find the best 3G coverage)|
|Red Status on Coverage Unit||There is a hardware error||Try resetting the coverage unit by unplugging it and then plugging it back in. If problem persists return system for a service|
|7 segment display on the CU is cycling for more than a minute||The unit is taking longer than normal to make a link||Wait for the display to stop cycling, this could take several minutes. Move away from WiFi devices|
|No lights on Coverage Unit display||There is no power||Is it plugged in? Is there power at the outlet? Try exchanging the power supplies with the window unit to see if the power supply is defective.|
|Centre three bars on signal display of Window Unit are flashing||It means network operator data is missing.||Contact Cel Fi customer services|
|No segment lit on signal display of the Window Unit and status indicator on solid green||Cel FI is not receiving any 3G signal||Move the window unit to another room or area where you have more coverage. (use your mobile phone to find the best 3G coverage)|
|Status indicator on the Window Unit is on solid red||There is a hardware error||Reset the window unit by unplugging it and then plugging it back in again. If problem persists contact Cel-FI customer services.|
|Status indicator on Window Unit is flashing green for more than a minute||The window unit is attempting to complete regulatory compliance||Wait for the status indicator to stop flashing, this could take several minutes|
|No lights on Window Unit||There is no power||Is it plugged in? Is there power at the outlet? Try exchanging the power supplies with the coverage unit to see if the power supply is defective.|