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Callinger

Callinger

A secure second-number mobile application enabling Wi-Fi calling and messaging with global connectivity, privacy protection, and scalable telecom infrastructure.

Communications
Build & Launch
Validate & Architect
Growth Stage

Industries

Communications

Business type

Second Number / Communication App

Platforms

Web & Mobile

Year

2024

Duration

1 year

Team members

3

Description

Callinger is a mobile application that provides users with alternative phone numbers, enabling secure communication through Wi-Fi-based calling and messaging.

Inspired by platforms like Hushed, the app focuses on privacy, global accessibility, and regulatory compliance, allowing users to communicate without exposing their personal numbers.

The system integrates telecom infrastructure with a scalable backend, supporting real-time messaging, voice calls, and international usage, while ensuring data protection and fraud prevention.

In addition to the mobile application, the platform includes payment systems, backend infrastructure, and a supporting web presence, forming a complete product ecosystem.

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The challenge

The project required building a reliable telecom-based application with strict requirements around performance, security, and global operability.

  • Integrating third-party telecom APIs for real-time calling and messaging
  • Ensuring high reliability and low latency for communication features
  • Handling international compliance and regulatory constraints
  • Designing a scalable backend for user data and communication flows
  • Implementing secure payment systems across iOS and Android
  • Preventing fraud and ensuring user data protection

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Outcome

  • Delivered a fully functional second-number communication app
  • Enabled seamless Wi-Fi calling and messaging globally
  • Integrated secure and scalable telecom infrastructure (Tellnyx)
  • Implemented cross-platform payment systems (Apple & Google)
  • Successfully deployed mobile apps and supporting web platform
  • Created a scalable foundation for future feature expansion

Product screens

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Technology stack

Expo
Expo
Kotlin (Android)
Kotlin (Android)
NativeWind
NativeWind
React Native
React Native
Swift (iOS)
Swift (iOS)
Next.js
Next.js
React
React
Tailwind CSS
Tailwind CSS
TypeScript
TypeScript
MySQL
MySQL
NestJS
NestJS
Node.js
Node.js
Prisma ORM
Prisma ORM
AWS
AWS
Cloudflare
Cloudflare
Docker
Docker
Jenkins
Jenkins
Nginx
Nginx

Want to build something similar?

This product started with our Build & Launch approach — helping businesses turn ideas into clear, structured, and technically feasible solutions.

We work closely with founders to validate concepts, define the right architecture, and create a solid foundation before development begins.

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