App like Rebtel for Voip, Mobile Rechage and eSim

@AwaisChaudhry

Hello, I understand you want an iOS VoIP app like Skype with a virtual number, SMS, instant messaging, app-to-app and app-to-phone calls, HD video, international calling, and conference features, built with Swift/Objective-C for iPhone, using Sinch and C2CALL. My approach is to design a modular architecture: core VoIP with Sinch for signaling, media handling, and NAT traversal; a secure messaging layer; a virtual number module and SMS integration; a media pipeline optimized for HD video; and an admin/dashboard for provisioning. I’ll implement a clean, maintainable codebase with robust error handling, offline messaging support, push notifications, and graceful fallbacks. I’ll prioritize performance, battery life, and cross-service compatibility, delivering a scalable MVP and then add features like conference calling and international routing. What is the top priority feature set and launch region for the MVP? 8-10 important questions I should confirm with you: What platforms and regions should the virtual number support first, and what dialing rules apply for international calls? Do you require in-app purchases or subscription models for premium features like HD video or international minutes? Which Sinch/C2CALL services are mandatory at launch, and are there preferred alternatives? What are your target latency and jitter budgets for real-time calls across regions? Will you need number porting, SMS fallback, or two-factor authentication for user accounts? What security standa

@irsolutions

With over 10 years of experience in mobile development, including expertise in iOS app development, I understand the importance of creating a seamless VOIP app like Skype, Rebtel, and Fring for your project. Your requirement for a virtual mobile number, SMS, instant messenger, voice call functionalities, HD video calls, international calling, and conference calling is crucial for enhancing user experience. In the realm of mobile app development, I have successfully delivered projects in communication and video calling apps, ensuring high-quality performance and user satisfaction. My experience aligns perfectly with the features you are looking to incorporate into your app, and I am confident in my ability to meet and exceed your expectations. If you are ready to take your VOIP app project to the next level, I am here to help. Feel free to message me to discuss further details and get started on creating a top-notch app that meets all your requirements.

@eclairios

Hello, Developing a comprehensive iOS VoIP application, featuring virtual numbers, SMS, instant messaging, and advanced calling capabilities like HD video and conference calls using Sinch and C2CALL, requires specific expertise. I understand the intricacies of building such a robust, feature-rich communication platform. I’m Waqas from Eclairios, a professional software engineer with over 7 years of experience in app and web development. I have successfully completed 128 projects, earning a 5.0 rating from satisfied clients. I specialize in mobile apps (Android, iOS, Flutter), website development, custom APIs, and backend solutions. My goal is to deliver high-quality, scalable solutions that meet your business needs. Why hire me? ★ 100+ Projects Completed with 5-star rating. ★ 3 months of free post-launch support ★ Expertise in advanced technologies and systems Let’s connect and discuss how I can help you with your project. Best regards, Waqas

@corpmember29

Hello, I have carefully reviewed your requirement for a VOIP iOS app similar to Skype, Rebtel, and Fring with virtual numbers, SMS, instant messaging, app-to-app and app-to-phone voice calls, HD video calling, international calling, and conference features integrated with Sinch/C2CALL. I have 10+ years of experience in VoIP, real-time communication, SIP/WebRTC, CallKit integration, push notifications, and scalable backend architectures. I clearly understand the complexity of virtual number provisioning, call routing, billing logic, and high-quality audio/video streaming. I will structure the development in clear phases: architecture planning, UI/UX wireframes, core VoIP integration, messaging module, testing, and deployment. I WILL PROVIDE 2 YEAR FREE ONGOING SUPPORT AND COMPLETE SOURCE CODE. WE WILL WORK WITH AGILE METHODOLOGY AND WILL GIVE YOU ASSISTANCE FROM ZERO TO PUBLISHING ON STORES. I am confident in delivering a stable, secure, and scalable solution aligned with your concept. I eagerly await your positive response. Thanks.

@diektech

Hi, this is Elias from Miami. I read your scope and I understand you want a full iOS + Android VoIP app that includes virtual mobile numbers, SMS, app-to-app + app-to-phone calling, mobile recharge / international topups (DING-style), an eSIM store, payment gateway, and API integrations powering all services. I’ve worked on real-time apps with VoIP + billing flows where the “make it work” part is easy, but production quality requires: clean provider integrations, call reliability (push/CallKit/FCM), accurate wallet/charging, and strong logging + retry/idempotency so topups/SMS/calls don’t double-bill. My approach would be: pick best-in-class providers for each module (numbers/SMS/voice, topup, eSIM) and build a unified backend that normalizes them into one user account, one ledger, one purchase flow, and one admin panel. Q1: Which providers do you already have (Twilio/Vonage/Telnyx for voice/SMS, DING API or other topup aggregator, eSIM provider like Airalo/1GLOBAL/Truphone/etc.)? Q2: Do you need users to have a wallet balance (prepaid) + per-minute billing, or subscription plans + pay-as-you-go? Q3: What countries should virtual numbers + topups + eSIM cover in MVP? Once you confirm providers + countries, I can give a fixed-price quote with milestones (MVP: auth, numbers, SMS, calls, payments, topup, eSIM, admin) and store-ready builds. Regards, Elias

@vbcool7

With my rich experience of 7 years in the industry, I am convinced that I have the skills and expertise needed to create an app similar to Rebtel with immense efficiency and quality. I have a knack for mobile development, be it Android or iOS, utilizing native technologies as well as cross-platform frameworks like Flutter. This enables me to cater to your target audience and bring your ideas into reality. Moreover, my competencies extend beyond just mobile development. I am also proficient in Web Development, Database Management, and API Integration -- all of which are essential components for this project. My experience will come in handy in designing and implementing APIs, marrying different services together and ensuring seamless functionality across the board. Choosing me as your developer not only means you are getting a competent individual but also someone dedicated to client satisfaction, timeliness, and innovation. I value clear communication and would ensure consistent updates at every stage of the development process. Together, we can create a robust app that exceeds expectations – an app that is highly responsive, well-designed and adept at executing complex functions like Voice Calls, SMS, Recharges as well aiding E-SIM Integration in a secure manner.

@OutsourceMan

⭐⭐⭐⭐⭐ Dear Valuable Client, CnELIndia, under the leadership of Raman Ladhani, can expertly handle the development of your iOS VoIP app. Our proven track record in C programming and mobile app development ensures smooth integration of features like virtual mobile numbers, SMS, instant messaging, HD video calls, and international voice calling. We specialize in using top-tier technologies such as Sinch and C2Call to enable seamless voice and video communication, including app-to-app and app-to-phone capabilities. Our process includes: Requirement analysis and app architecture design. Swift and Objective-C development for optimal performance. Integration of C2Call and Sinch SDK for VoIP, SMS, and video calling. Rigorous testing and quality assurance to ensure flawless functionality. Continuous support for updates and scalability. With a focus on reliability and user-friendly design, we guarantee a top-notch solution.

@softsolution2000

I have extensive experience in C Programming, Mobile App Development, iPhone, Objective C, and Swift, making me a great match for the VOIP APP project. Budget can be adjusted after discussing project scope. My priority is to work within your budget. Please review my 15-year-old profile to see my work history. Your satisfaction is my priority. I am ready to start working to demonstrate my commitment. Let's discuss the job details. Eager to hear from you.

@kamran2012

Hi, I will build your Rebtel-style VoIP app for Android and iOS with virtual number provisioning, SMS messaging, voice calling (app-to-app and app-to-phone), international mobile top-up integration via a provider like DingConnect, an eSIM store module, and payment gateway integration for wallet top-ups. For the VoIP call quality, I will use a SIP-based stack with adaptive bitrate codec switching (Opus for WiFi, AMR-NB for poor connections) so call clarity stays consistent even when the user moves between network conditions. Questions: 1) Do you have a VoIP trunk provider selected, or do you need a recommendation (Twilio, Vonage, Plivo)? 2) Which regions should the mobile top-up service cover at launch? 3) Should the eSIM store integrate with a specific provider like Airalo, or a white-label solution? Looking forward to your response. Best regards, Kamran

@divumanocha

Hello, I came across your project and found it truly interesting. With over eight years of hands-on experience in this field, I have successfully delivered high-quality solutions to clients worldwide. My dedication to excellence is reflected in the 180+ positive reviews from satisfied clients. I’d love to bring this expertise to your project and ensure outstanding results. However, I do have a few important points I’d like to clarify to align perfectly with your vision. Let’s connect via chat, where I can also share relevant examples of my past work. I'm looking forward to hearing back from you! Best Regards, Divu.

@techplusintl

Hi there, I understand you're looking to develop an iOS VoIP app that includes features like virtual mobile numbers, SMS, instant messaging, voice calls, HD video calls, and conference calling. This is a comprehensive project that requires careful planning and execution. I will approach this by first outlining the project requirements and creating a detailed roadmap. Utilizing technologies like Sinch and C2CALL, I will ensure seamless integration for voice and video functionalities. My focus will be on delivering a reliable and user-friendly application. Communication is key, and I will keep you updated throughout the development process. You can expect high-quality work that meets your specifications and timeline. I am excited about the possibility of working together. Please feel free to reach out if you have any questions or need further clarification. Best regards, Burhan Ahmad TechPlus

@zainalitariq245

Hello Dear, I am a top-rated highly experienced mobile app developer with a proven track record of successfully creating numerous high-quality applications. I can develop a full featured VoIP and telecom app similar to Rebtel and Ding for both iOS and Android using a scalable cross platform framework. The app will support virtual mobile numbers, SMS, app to app and app to phone calls, international mobile recharge, eSIM store integration, secure payment gateway setup, and complete API integration for all telecom services. You will receive a production ready, secure, and high performance solution built for global scalability and seamless user experience. Please Take a Look at My Professional Portfolio: https://www.freelancer.pk/u/zainalitariq245 Let's connect to discuss your project in more detail. Best Regards, Zain

@kareemmaize

Hi there To build an app like Rebtel with VoIP, virtual numbers, international top-up, and eSIM sales, the most critical part is architecting the telecom backend and billing engine correctly—not just the mobile UI. This requires integration with SIP providers for voice, DID/SMS gateways, recharge aggregators (like DING-type APIs), and certified eSIM distributors. Each service must tie into a centralized wallet and real-time billing layer with fraud protection. I would design this as an API-first architecture (Node.js or similar) with a scalable telecom service layer, then build native-quality mobile apps on top. Payment gateway integration would support wallet funding, subscriptions, and transactional flows. Once we clarify which telecom aggregators and eSIM providers you plan to partner with, I’ll provide a detailed phased roadmap with milestones and cost breakdown.

@abhisaini0188

With over a decade's worth of in-depth knowledge and hands-on experience in the Mobile App Development field, I'm confident that I am the best professional to design and develop an app like Rebtel for Voip, Mobile Recharge and eSim, specifically equipped for Android and iOS. My proficiency extends steadfastly across multiple languages and frameworks such as MEAN / MERN Stack, LAMP, Laravel, among others; thus enabling me to deliver scalable and secure solutions for your task. Notably, my approach towards software development emphasizes reliability, maintainability, and most importantly - business-driven solutions. This aligns seamlessly with your project scope that requires a virtual mobile number, SMS functionality, Voice call facility, API integration (which I'm quite skilled at), payment gateway implementation, eSIM store design — just to name a few. Additionally, my firm grasp on Cloud & DevOps will ensure your app enjoys the benefits of AWS's top-notch infrastructure while providing you long-term support post-delivery. My central tenet is always client satisfaction; I'll work closely with you to ensure every requirement is met with utmost precision while proposing improvements for even better results. Let's begin creating something extraordinary together!" With Regards!

@rbtech1984

Hello There!!! I understand you need a cross-platform VoIP app like Rebtel, offering virtual mobile numbers, SMS, app-to-app and app-to-phone calls, mobile recharge/international top-up, eSim store, and integrated payment gateways and APIs for all services. Services 24*7 available for discussion(reply in a few hours) Ui & UX design with unlimited revisions Deployment Support Source code will be provided at the end of the project 90-days support for bug fixing With 9+ years of mobile app development experience in Android and iOS, I can build a smooth, secure, and feature-rich VoIP solution. I’ll use Flutter/React Native for cross-platform efficiency, integrate reliable APIs for calling, SMS, recharge, and eSim, and ensure payment gateways work seamlessly. Full source code, documentation, and a walkthrough will be provided. I’m ready to start asap and discuss your preferred tech stack and timeline. Warm Regards, Farhin B.

@brayanstiven5

Hi, there, as an individual freelance engineer, I have extensive experience in Swift, C Programming, Objective C, and iPhone app development. My portfolio includes successful VoIP apps with features like instant messenger, HD video calls, and conference calling, meeting the demands for iOS VoIP apps. ✅ Leveraging Sinch and C2CALL, I will craft a cutting-edge VoIP app, integrating virtual mobile numbers, SMS capabilities, and seamless app-to-app/app-to-phone voice calls. ✅ Implementing a secure and user-friendly interface, HD video calling, and international calling functionalities. ✅ Ensuring flawless integration of essential features like virtual numbers, messaging, and high-quality voice and video calling. ✅ Conducting thorough testing and optimization to deliver a reliable and responsive app. ✅ Providing post-launch support and updates to enhance user experience and app performance. I look forward to working with you. Best Regards. Brayan

@dfordesigners

Hi I’m your web developer, ready to turn your project VOIP APP like Skype, Rebtel, Fring into reality! I’d love to discuss the details and create something amazing together. Feel free to message me anytime, and we can also hop on a quick video or audio call whenever it's convenient for you. I’ve developed many projects exactly like what you’re looking for. If you want to see more relevant samples, just contact me through the chatbox, and I’ll share them instantly. ★ Why Clients Trust Me 500+ successful web projects delivered 430+ positive client reviews Expert in C Programming, Mobile App Development, iPhone, Objective C, Swift WordPress, Shopify, PHP, JavaScript, HTML, CSS, Plugin/Theme Development, Laravel, WebApp Clean, modern, responsive and SEO-optimized designs Fast delivery, great communication, and long-term support Available during EST hours for smooth collaboration If you want a professional developer who delivers quality work on time and stress-free, let’s connect. I’m excited to help build something amazing for you. Best regards, Kausar Parveen

@LiveExperts

Hello, Choosing me for your iOS VoIP app project would be the smart choice. With my extensive background in computer science and software development, including proficiency in MatLab and Mathematica, Python, Java, C/C++, C#, and many others, I am well-equipped to handle the complex task of creating a multifaceted app that encompasses all the features you desire. Having handled projects involving Machine Learning, Deep learning, Artificial Intelligence (AI), Algorithms and more, I understand the importance of enhancing user experience, as well as ensuring seamless functionality across all components of an app. This means your users can expect reliable Voice call functionality for both in-app and international calls, Crystal clear HD video calls irrespective of location or device, smooth conference calling abilities and a hassle-free app-to-phone numbers feature. Additionally, we have expertise in Linux & Bash plus experience working with tools such as Sinch, C2CALL which you mentioned are part of your project requirements. My experience extends to aspects like cloud computing - utilizing its power to store massive amounts of data in a structured manner to facilitate easy access and quick analysis. I'd love to discuss further how our team at Live Experts LLC can turn your idea into an efficient reality! Thanks!

@ayesha0124

Hi there, I'm excited about the opportunity to develop a robust VOIP app like Skype or Rebtel, tailored to your specifications. With extensive experience in Objective C and Swift, I've successfully delivered high-quality mobile applications that include features such as virtual mobile numbers, SMS capabilities, and HD video calling. I understand the importance of seamless communication, especially with international calls and conference calling features. My expertise in using frameworks like Sinch and C2CALL ensures that I can integrate these functions efficiently, providing users with a smooth and reliable experience. I propose a timeline of 30 days to develop and refine the app, ensuring that it meets your standards. Please let me know if you have any specific functionalities in mind or additional features you'd like to discuss. Best regards,