Several years ago, we started Cel-Fi because we got really frustrated at the lack of indoor coverage of mobile networks, and thought that we should do something about it. Traditional analog-based signal boosters were not (and still are not) that exciting to us, we thought we could do better than that by moving to a full digital solution. Plenty of indoor solutions and products existed, but as their numbers increased it became clear to Operators worldwide that their usefulness was limited and they were actually harming network capacity and profit. We realized that a completely new type of product would be needed, and we decided to build a booster with none of the potential for degrading the wireless network for which analog repeater products are infamous. A team of some of the industry’s best minds was assembled to work along side Operators to define Cel-Fi requirements & design.

Fast forward to today, we just released the second generation of our product, Cel-Fi, and are really proud of it. Completely new, very different, and it works. Cel-Fi is the all-digital, high tech mobile booster that we dreamed of. And its performance keeps surprising us. So much in fact that even the network operators have adopted it. We like to say that we became the leading developer of indoor coverage technology, which optimizes the experience of wireless subscribers and increases Radio Frequency (RF) network capacity for mobile operators. Along the way, we built a significant patent-pending technology portfolio.

With our veteran engineering team, we leveraged advanced signal processing and intelligent antenna design to create a new market for self-configuring, environmentally aware indoor coverage systems. Cel-Fi Systems are carrier-grade devices that are designed to eliminate in-building dead zones and work in harmony with the cellular macro network. And yes, we are based in San Diego!



Sales Team

Looking to buy more than five Cel-Fi? Contact our sales team, sales@cel-fi.com


Have more technical or basic support questions? Send your questions to us at support@cel-fi.com


Press enquiries? Send us your questions here pr@cel-fi.com, and we will reach out you.


Want to help others get a Cel-Fi? Become a reseller for Cel-Fi by contacting our Reseller Department or simply Apply Online and we will reach out you!

Corporate Social Responsibility


Nextivity values and fosters integrity in all our relationships. It is our priority to build and maintain long-term positive relationships. We stand by our commitments to employees, customers, and suppliers.

Ethical treatment of all parties in the supply chain through to the customer is a pre-requisite. Our agreements include personal contact (visits) with each supplier to ensure their facilities, treatment of their employees, and work environments are safe and healthy.

Nextivity complies with all applicable environmental and safety regulations, including the RoHS (Restriction of Hazardous Substances) and WEEE (Waste Electrical and Electronic Equipment) directives. We strive to use recyclable materials in our products and packaging.

Our sponsorship initiatives focus on fostering leadership, collaboration, and innovation, as well as social responsibility within the communities we serve. We support The Hansen Summer Institute on Leadership and International Cooperation, the Rancho Bernardo High School Robotics program, the Del Norte High Academic League, and the Women of AT&T National Organization Leadership Summit.

We also support or sponsor causes and programs that are near and dear to our employees, including community-based initiatives such as the City Year Seattle/King County Ripples of Hope Event, WILDCOAST Dempsey Holder Ocean Festival & Surf Contest, the Athena San Diego Pinnacle Awards, and the Mid-City Little League.

Nextivity complies with all applicable environmental and safety regulations. We are RoHS and WEEE compliant and use recyclable materials in our Product and Packaging.

911 Warning


E911 systems automatically provide a 911 caller’s call back number to emergency service personnel and, in most cases, location information. When you use a signal booster to complete a call to 911, this location information may not be provided or may be inaccurate. This may affect the ability of emergency personnel to locate you if necessary. It is important to remember that signal boosters may help you complete calls, including calls to 911, in areas where you previously couldn’t. Each person should decide whether to use a signal booster given their individual circumstances.