Cel-Fi GO G51 5G Dual Band Cellular Mobile Phone Repeater for Telstra and Optus G51-LE-003

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Quick Overview

The one and only 5G cellular repeater approved in Australia by Telstra and Optus.

The Cel-Fi G51 is a more powerful unit than it's predecessors with up to 27dBm of power where the G41 is limited to 20dBm and the and G31 at 16dBm.

The Cel-Fi G51 boasts it can repeat up to 570Mbps download speeds with the right setup and antenna configuration.

Why just have an LTE router that only gives you Wi-Fi when you can have real connectivity for voice calls and data through your standard phone or SIM enabled device.

There are no fees with the Cel-Fi GO G51. Just register it in your name when you first turn it on, then use it free of charge allowing your phone or SIM enabled device to handle the standard fees you are already billed. That's right, there are absolutely no fees to use the Cel-Fi GO G51 as it is a cellular repeater which repeats the existing available signal and boosts it up to 100dB allowing improved cellular coverage in areas where there is limited or no coverage.

Whats in the box:

1x Cel-Fi GO G51 Repeater

1x 240V AC Power Cable

1x Ethernet Cable


On all in-stock items

Cel-Fi GO G51 5G RepeaterCel-Fi GO G51 5G Repeater

The Cel-Fi GO G51 5G NR 3500MHz mobile phone repeater from Nextivity is fully approved by Telstra and Optus to use in Australia. 

This powerful 5G cellular repeater, which some may call a 5G mobile phone booster is the ONLY approved 5G cellular repeater in Australia* for small to medium consumer/private spaces without requiring cellular carrier authorisation and planning. 

With a massive 27dBm 5G output, 100dB signal gain and a whopping download speed throughput of up to 570Mbps**, this repeater stands tall above it's predecessors and is a cost affordable solution for small to medium business requiring reliable cellular connectivity.

The CelFi G51 will ultimately perform best when installed by certified professional installers. Tin Can Solutions are Cel-Fi Certified Enterprise Installers and can either set you up with the correct gear for a professional and well calculated installation, or we can provide installation services throughout QLD Australia.

Multi Carrier Support

The Australian model of the G51-LE is compatible with Telstra and Optus. Vodafone is not approved on the G51 at the time of writing this.

Only 1 provider can be used at any one time which is easily selectable from within the Nextivity Wave app under Settings > Operator. This means that if you ever need to switch phone providers, it is an easy swap of carriers which only takes a couple of minutes.

This option does take a few minutes as it needs to download the new software update from Nextivity servers which requires cellular coverage, or a connection to the Wave portal via ethernet cabling connected to a internet connected switch and a Nextivity Cel-Fi approved installer to connect and initiate the update.

Simple Installation

The above image depicts the G51 at a window using a paddle or omni-directional antenna communicating with the cellular tower. While this is achievable, the signal quality is rarely good enough to obtain desired results without an external antenna, plus separation between the 2 antennas is required which becomes very hard to achieve in this scenario. But it does show you what is possible if cabling access is limited.

Advanced Installations

Directional Donor Antenna with Single Server Antenna

Directional Donor Antenna with Dual Server Antennas

Directional Donor Antenna with Dual Repeaters and 4 Server Antennas

Courtesy of Nextivity

Bringing the power of the macro 5G network indoors, CEL-FI GO G51 solves coverage challenges for the shorter range of mid-band 5G NR.

The system delivers industry-leading signal gain up to 100 dB to overcome mid-band 5G NR coverage challenges that no other solution can.

In addition to unmatched performance, GO G51 is compact, easy-to-use, and does not require manual configuration, making it easier than ever before for building owners to equip their buildings with 5G connectivity and ensure better voice quality, 5G data speeds, and fewer dropped calls.

GO G51 is perfect for small- to medium-sized buildings, operator approved, unconditionally network safe, and offers the flexibility to support various 2G/3G/4G and 5G cellular networks.

Nextivity Cel-Fi GO G51 Attributes:

  • Works on 3G, 4G & 5G NR 3500MHz Voice and Data
  • Bluetooth Connectivity for Setup
  • Ethernet Connectivity for Monitoring and Configuration
  • Covers an area of approximately 3,000 m2 depending on site
  • Multi-Band Support
  • IP20 Indoor Rated
  • Network Safe
  • Australian Communications Media Authority ( ACMA ) Approved

* At the time of writing this article.

** Theoretical calculated speeds based on hardware performance. These figures may vary dependent on environmental factors such as the received signal strength and quality, Signal to Noise ratio (SiNR), system installation/setup, and ultimately the cellular towers output at any given time.

Note: 5G low bands are not covered by the G51 as it is designed for suburban areas where Band 78 5G NR 3500MHz is available. The Cel-Fi G41 is a lower cost alternative if band 78 5G NR is not available in the area.

More Information
Product Dimensions255mm(W) x 87mm(D) x 28mm(H)
Product Weight600 grams
Temperature Range0° to 65°C
Input Voltage9.6 to 28.8 VDC
Power15W Max
CaseOne piece extruded Aluminium
Cellular CarrierTelstra, Optus, Vodafone, Carrier Selectable
RF GainUp to 100dB gain
RF Connectors2x SMA Female


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