Trusted VoIP App for Second Numbers, HD Calls & Smart Messaging.
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Secure VoIP Calling • Virtual Phone Numbers • Unlimited Calls & Texts • Native Mobile App Development
VoIP Calling & Second Phone Number App Development for iOS & Android (Native Swift + Kotlin)
Ring4 is a powerful communication app that gives users a second phone number, unlimited VoIP calls & texts, video conferencing, spam blocking, and HD call quality; All built using Native iOS (Swift) and Native Android (Kotlin).
As a mobile app development expert, we developed this high-performance communication app to support global calling, real-time messaging, call recording, visual voicemail, and secure multi-country numbers without needing a carrier plan.
Ring4 App’s Now Live on the App Store & Google Play
Experience Ring4 across iOS and Android, built with native Swift and Kotlin to ensure fast performance, secure VoIP calling, and a smooth communication experience.
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About Ring4 – Native VoIP Calling & Virtual Number Mobile App Development
Ring4 is a native iOS and Android VoIP calling and messaging app that helps users create a second phone number without needing a carrier plan or SIM. Built using Swift (iOS) and Kotlin (Android), Ring4 delivers a fast, secure, and high-performance communication experience ideal for professionals, travelers, entrepreneurs, and anyone who needs a private virtual line.
Our development focus was to build a scalable VoIP communication platform that supports:
• Second phone line creation (US, CA, UK, FR)
• Unlimited VoIP calls & SMS
• HD video meetings
• Call recording & voicemail
• Spam & robocall blocking
• Subscription-based IAP plans
By combining native mobile app development, optimized VoIP integrations, real-time communication APIs, and seamless UI/UX, we engineered a product that handles high call volumes, delivers crystal-clear audio, and offers a smooth onboarding experience for global users.
Ring4 demonstrates our expertise in:
Native iOS development, Native Android development, VoIP app development, Calling app development, Real-time communication, Payment integration, Subscription systems, Secure mobile architecture, and scalable backend connectivity.
UI/UX Design for Ring4 – Seamless Native Calling & Messaging Experience
Delivering a smooth, reliable communication experience was at the core of Ring4’s UI/UX strategy.
Our team designed a clean, intuitive, and high-performance interface that supports real-time calling, messaging, voicemail, and virtual number management; ensuring users feel confident and in control.
We focused on a native iOS and Android design system, guaranteeing fast performance, familiar interactions, and accessibility for all types of users, whether they’re individuals, professionals, or business teams.
Key UI/UX Enhancements
✔ Minimal, professional interface optimized for VoIP calling and virtual number management
✔ Easy navigation with clear tabs for Calls, Contacts, Messages, and Settings
✔ Native dialer experience for fast number input and actions
✔ Smart inbox organization for missed calls, unread messages, and voicemail
✔ Clean contact management workflows including tags, notes, and multi-line profiles
✔ User-friendly onboarding with multiple sign-in options (Apple, Google, Email)
✔ Accessible layouts designed for speed, clarity, and low-friction usage
By combining native app design principles, performance-focused flows, and scalable UI architecture, we ensured Ring4 delivers a premium communication experience across both platforms.
Ready to Build a VoIP or Communication App?
Whether you want to create a virtual phone number app, VoIP calling app, business communication platform, or secure messaging solution, our expert team at Square Infosoft specializes in native iOS & Android app development that delivers speed, stability, and real-time performance.
Let’s turn your idea into a powerful, scalable, and feature-rich communication product; just like Ring4.
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Start Your Native App Development Project with Square Infosoft
Looking to build a secure, scalable VoIP calling app, messaging app, or any native iOS/Android mobile application like Ring4?
Our expert team at Square Infosoft is ready to help you bring your idea to life with high-performance, user-focused solutions.
Fill out the form below and our mobile app development team will get back to you within 24 hours.
