Android VoIP App Development

@eclairios

Hello, The project requires an Android app enabling users to instantly purchase and manage virtual local numbers, including call forwarding, voicemail, and SMS, using a telecom API. I understand you need a robust Kotlin-based MVVM client, integrated with a backend for user and number management, culminating in a successful Google Play Store launch. This aligns perfectly with my expertise in building high-performance communication applications. 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

@mrresearcher99

Hi, I can help you build this Android app end to end. I have 5+ years of experience in Android and iOS development, working with Kotlin, Java, Flutter, and React Native, and I’ve handled API-driven apps including VoIP and SMS features. I will develop a native Android app in Kotlin using MVVM, Jetpack components, Coroutines, and Retrofit, with no WebViews. The app will allow users to browse, purchase, and configure local virtual numbers using providers like Twilio, Plivo, or Telnyx. Call forwarding, voicemail setup/playback, and two-way SMS will be implemented via secure REST or SIP APIs with real-time updates. I can set up a lightweight backend or Firebase for authentication, number mapping, and billing tokens, fully documented in the README. The app will be optimized for fast call routing, run crash-free on Android 8–14, and follow Google Play call/SMS permission policies. Deliverables include the complete Android Studio project, release-ready APK, setup documentation, and full Play Store submission. Happy to discuss provider choice, timeline, and milestones. Best, Bhargav

@pinkeegupta

Hi I have read your requirements and I am sure I will be able to help you. Please message me so that we will have detail technical discussion. I have 9+ years of combined experience in Mobile Application development, Website development, Desktop application development, 3rd party Artificial Intelligence api, AR/ VR, Chatbot, Blockchain- Cryptocurrency, CRM & ERP, Game Development and any other Software development. Please consider me and initiate a chat for further detailed discussion. Regards, Anju

@Rajoriadares

Hello Client, Greeting of the day!!!! I read your job description I have sound of five years plus experience in App development. I have been DEVELOPED 35+ Apps, three taxi apps, Two socials apps and restaurant apps based on GPS location and notification functionality and based on different domain like sports, Health, GYM, personal business and social etc I have testing team for testing apps. I think I am strongest person for doing this job and provide the quality product with testing. I am always available for your support. Thanks Sr. Mobile Developer

@Riasatali78

Experienced Android developer with VoIP/SIP expertise — I’ll deliver a Kotlin MVVM app integrating Twilio/Plivo APIs for instant number purchase, forwarding, voicemail, and SMS. Play‑ready submission, secure backend, and full documentation included.

@softwarelinkerrs

As one of the most trusted names in Android App development, my team at SoftwareLinkers can assure you of an optimal solution to your VoIP app needs. Building secure, scalable systems that cater to specific business requirements is our forte. Our skillsets align seamlessly with your project demands, especially in terms of Kotlin, MVVM structure and utilisation of native Android components. Moreover, we hold a strong background in backend development for data-driven applications. This proficiency has equipped us well to tap into APIs and integrate them precisely, in line with the mobile and web platforms - just what you need for Telecom API integration. Also, I’d like to highlight our specialization in building RESTful APIs as well as our experience with SIP on multiple projects. Another crucial aspect we've mastered pertains to Play Store policies and submissions; keeping up with Google's ever-changing standards is something we do consistently. Finally, I must emphasize our dedication to clarity and on-time delivery throughout the tenure which shines through our long-standing client relationships and numerous repeat hires. Choosing SoftwareLinker goes beyond hiring a developer; it’s about partnering with an extended technical arm that'll meticulously plan, deploy, and support you throughout your project. So, let's get talking!

@kishanbwts

I have developed Android VoIP apps before, integrating telecom APIs like Twilio and Plivo to manage virtual numbers, call forwarding, voicemail, and SMS. For this project, I’ll build the app in Kotlin using MVVM and native components, ensuring all settings update instantly via REST or SIP calls. I suggest Firebase for user accounts and billing tokens due to its real-time updates and scalability, but I’m open if you prefer a lightweight custom backend. I will document provider setup and how to enable all features in the README. A key focus will be keeping call setup under one second and stable SIP handling across Android 8–14 while fully complying with Play Store SMS/call permissions. I can deliver a complete Android Studio project, release-ready APK, and handle Play Store submission to publishing. Which SIP provider or API would you prefer for virtual number inventory, or should I pick the best based on your target countries? Also, do you have any preferred method for voicemail storage (cloud vs local)?

@techsty2014

Hello, I will build a fully native Android app in Kotlin using MVVM that allows users to purchase a local virtual number directly in the app and instantly configure call forwarding, voicemail and two-way SMS. The app will integrate with a telecom provider such as Twilio, Telnyx, or Plivo and apply all changes in real time through their APIs. I will set up a lightweight backend or Firebase to manage users, numbers and billing securely, deliver a crash-free app compatible with Android 8 to 14. The project will include complete source code, a release-ready APK, full setup documentation and submission to the Google Play Store in compliance with call and SMS policies. 1-Which telecom provider do you plan to use Twilio, Telnyx, Plivo? 2-Do you prefer Firebase for faster deployment, or a custom backend for more control? Looking forward to discussing further. Best regards, Faizan

@Rahulsingh5xz

Hello, I’m Rahul Singh from Team Velora, and we have been running for the past 3 years with an experienced Android and VoIP development team. We clearly understand your requirement to build a native Kotlin-based Android app that allows users to purchase local virtual numbers and manage call forwarding, voicemail, and SMS in real time using telecom APIs. Our experts will deliver a Play Store–ready app following MVVM architecture, compliant with call/SMS policies, and fully tested across Android 8–14. Let’s connect in the chat box to discuss the project regarding provider selection and execution flow.

@jagratip3

Hello, I’m Jagrati, an Android developer with hands-on experience building native Kotlin applications, including apps that integrate telecom APIs, real-time configuration flows, and permission-sensitive features (calls, SMS, notifications). Your requirement is well-defined, which is great. I can deliver a clean MVVM-based Android app where users can purchase a local virtual number and manage call forwarding, voicemail, and SMS seamlessly—without breaking the user flow. How I’d approach this: Native Kotlin + MVVM using ViewModel, LiveData/StateFlow, and Repository pattern Telecom integration with providers like Twilio / Telnyx / Plivo via REST APIs for number purchase, forwarding, voicemail, and SMS Real-time updates using webhooks + Firebase / lightweight Node backend for sync and billing tokens Fast VoIP handling (under 1s ring time) using SIP or provider SDKs where applicable Permission-safe implementation fully aligned with Google Play call/SMS policies Crash-free support from Android 8 to 14 Deliverables covered: Full Android Studio project (well-documented) README with provider setup, API keys, and configuration steps Release-ready APK for testing Play Store submission and go-live support If you’re looking for a developer who can ship this end-to-end—clean code, real-time behavior, and Play Store–ready—I’d be happy to get started. Best regards, Jagrati

@irbrencoronel

I’ve built and published production-ready VoIP/SIP apps, so your proposed flow is fully achievable and technically sound. The Android app will be fully native in Kotlin, using a clean MVVM architecture and modern Android components. Users can register, browse available local numbers, purchase one in-app, and instantly configure call forwarding, voicemail, and two-way SMS. All changes are applied in real time via the VoIP provider’s REST APIs and SIP signaling when required, keeping incoming call latency under one second. I recommend a lightweight MERN backend (Node.js, Express, MongoDB) to securely manage users, number inventory, billing tokens, and webhooks. This provides better scalability and control than relying solely on Firebase. The app will comply with Google Play call/SMS policies, run reliably from Android 8 to 14, and be delivered with full source code, technical README, a release-ready APK, and support through Play Store publication. I can start immediately and adapt to your schedule.

@aman720gupta

Hello ? I can build a native Android app that lets users purchase a local virtual number and manage call forwarding, voicemail, and SMS entirely within the app. ✅ What I’ll implement Sign-up → browse available local numbers → instant purchase Integration with Twilio / Plivo / Telnyx (I’ll recommend the most stable option) Post-purchase setup screens: Call Forwarding (real-time updates) Voicemail (greeting + playback) Two-way SMS on the same number Changes applied instantly via REST APIs / SIP ? Technical Details Kotlin + MVVM, 100% native Android (no WebViews) VoIP stack optimized for <1s incoming call ring Lightweight backend using Firebase or Node/.NET (fully documented) Crash-free on Android 8–14 Compliant with Google Play Call/SMS policies ? Deliverables Complete Android Studio project (source) README (provider setup, API keys, feature enablement) Release APK for testing Play Store submission & go-live ? Why me 11.5+ years Android experience Shipped VoIP / SIP & telecom API apps Strong focus on reliability, latency & policy approval Happy to discuss provider choice, backend setup, and timeline.

@KarthikTechCon

Hi, I’m Karthik, an Android & backend engineer with 10+ years of experience building VoIP, telecom-integrated, and real-time mobile applications. I can deliver a production-ready Android VoIP app in Kotlin, fully compliant with Google Play policies, allowing users to purchase and manage local virtual numbers end-to-end. What I’ll build • Native Android app (Kotlin, MVVM) – no WebViews • User signup, number search & purchase via Twilio / Telnyx / Plivo (or your choice) • Call forwarding setup with real-time updates • Voicemail recording, playback & message management • Two-way SMS on the purchased number • Sub-second call routing using provider APIs / SIP Backend • Lightweight backend or Firebase for users, number inventory & billing tokens • Secure API handling & provider webhooks Delivery • Complete Android Studio project + source code • README (provider setup, API keys, call/SMS flows) • Release-ready APK • Play Store submission & go-live support Why me • Proven experience shipping VoIP & SIP-based Android apps • Strong knowledge of telecom APIs & Android call/SMS permissions • Focus on stability (Android 8–14) and crash-free builds I’m ready to start immediately and can share relevant VoIP app examples. Regards, Karthik 10+ yrs | Android VoIP & Telecom Apps

@GobindSawarn

My ability to comprehend complex technical aspects while effectively communicating with my clients has proven valuable in prior projects. Thus, I assure you that I can create a user-friendly interface and implement the telecom API (e.g., Twilio, Plivo, Telnyx) in compliance with their REST endpoints or SIP signaling for an uninterrupted experience. Documenting the setup procedures through README will also be included to ensure clear understanding for future users of the application. Most importantly, I am committed to delivering reliable software that exceeds expectations while maintaining a long-term vision for upkeep. As an end-to-end developer with improved fluency in Java and Mobile App Development, I aim to create a crash-free version of the app - well compatible with different Android versions and perfectly aligned with Google Play call/SMS permission policies as per your acceptance criteria. Let's bring your idea to life!

@softandrew

Hello, I’ve shipped production Android VoIP apps using Twilio and Telnyx, built in Kotlin with MVVM and native components. I can deliver number purchase, real-time call forwarding, voicemail, and SMS, plus a clean backend and Play Store–compliant release. You’ll get reliable performance, clear documentation, and smooth submission on time always guaranteed

@sgwtechnology

Hi, this is Mukesh. I’ve carefully reviewed your project to build an Android app for purchasing and managing local virtual numbers, and it aligns perfectly with my experience in VoIP/SIP mobile applications. I have hands-on expertise building Kotlin apps following MVVM architecture, integrating telecom APIs like Twilio, Plivo, and Telnyx, and ensuring real-time call forwarding, voicemail, and SMS functionality. My Approach: Android Client: Native Kotlin app with MVVM, Jetpack components, and clean UI for browsing, purchasing, and configuring numbers. VoIP Integration: Real-time call handling, forwarding, voicemail playback, and SMS using SIP/REST endpoints, ensuring sub-second ringing for incoming calls. Backend/Firebase: Lightweight backend to manage accounts, number inventory, billing tokens, and secure credentials. Fully documented. Google Play Compliance: Handle permissions, API requirements, and produce signed APK/App Bundle ready for Play Store submission. Deliverables: Full Android Studio project with source code README with setup instructions and API keys Release-ready APK for testing Live Play Store submission Acceptance: App will be crash-free (Android 8–14), all features fully functional, and compliant with Play Store policies. I have successfully shipped VoIP/SIP apps before and can deliver this end-to-end, production-ready solution quickly and reliably. Regards, Mukesh Android & VoIP App Specialist

@jorginhoo1

I can build a native Android application in Kotlin (MVVM) that allows users to purchase a local virtual number and instantly manage it from their phone. The app will let users browse available numbers from a telecom provider (such as Twilio, Plivo, or Telnyx), buy one inside the app, and configure it through simple screens for call forwarding, voicemail, and SMS. All changes will apply in real time using the provider’s REST APIs or SIP signaling. Users will be able to: • Purchase a local number without leaving the app • Forward incoming calls to another number • Record and play voicemail greetings • Send and receive SMS on the same number The app will be built with native Android components (no WebView) and follow a clean MVVM structure. A lightweight backend or Firebase layer will manage users, number inventory, and billing tokens, fully documented. Deliverables include the full Android Studio project, README with provider setup and API keys, a release-ready APK, and Google Play Store submission. The app will be tested on Android 8–14 and comply with Google Play call and SMS permission policies.

@dushyant317

Hello, I’ve carefully reviewed your project requirements and clearly understand the tasks involved. I have 13 years of experience and strong expertise in the exact skills this project requires. I have successfully delivered similar projects before and can share relevant samples if needed. I will complete this within your expected timeline while maintaining quality and clear communication. I look forward to working with you and contributing sincerely to your project’s success.

@bhartimalu

Hello, I can develop an Android VoIP app using Kotlin, with high-quality audio calling, SIP/WebRTC integration, call management, notifications, and secure backend APIs. Experienced in VoIP optimization, real-time communication, and Play Store-ready deployments. Ready to discuss requirements and start immediately. Regards, Bharti M