# OpusTel > Secure VoIP calling app with a Swiss international number and HD audio. (iPhone/iPad app by OpusTel.) - Source: https://appshunter.io/ios/app/opustel/id945641896 (this page in markdown: same URL + `.md`) - Developer: [OpusTel](https://appshunter.io/developer/945641895) - Category: Utilities - Price: Free - Rating: 5.00/5 from 6 App Store ratings · 10 written reviews indexed - Age rating: 4+ - Requires: iOS 16.0 · 98 MB - Languages: American English, Arabic, Bulgarian, Czech, Danish, Dutch, French (France), German (Germany), Hebrew, Hungarian and 17 more - Released: 2015-01-11 - Data updated: 2026-08-04 - Monetization: free - User reviews in markdown: https://appshunter.io/ios/app/opustel/id945641896/reviews.md ## What is OpusTel? OpusTel OpusTel is the mobile phone App for iPhone, iPod and iPad, permitting one to use a real Swiss international telephone number, e.g. 0041 41 520 60 00. It allows one to make and to receive secure VoIP calls from any iOS device using 5G/4G/3G/UMTS or Wi-Fi Internet connectivity. It was developed with the focus on privacy. Features: 1. Secure incoming and outgoing calls 2. Incomming calls are free of charge (no roamingcosts) 2. HD high-definition audio quality with the G722 and Opus codec 3. Free global calls from OpusTel to OpusTel 4. Easy transfer calls to any telephone number 5. Ability to record incoming and outgoing calls 6. Conference calls 7. Automatic language selection based on handy language (15 languages like EN, DE, CN, FR, ES, IT ...) ## Key features - Real Swiss international telephone number - Secure VoIP calls - HD high-definition audio quality - Free global calls between users - Call recording - Conference calls - Automatic language selection ## Recent user reviews (10 of 10) All indexed reviews: https://appshunter.io/ios/app/opustel/id945641896/reviews.md ### 1/5 — kein Service *2025-01-02* Ich habe schon mehrfach per Mail geschrieben, dass ich den Anschluss nicht mehr benötige und kündigen möchte. Es gibt keine Reaktion, ausser das ich immer noch jeden Monat eine Rechnung erhalte. Es ist richtig nervend…. ### 5/5 — Sehr zuverlässig *2024-04-08, version 4.5* Auch geschäftlich sehr zuverlässig und mit guter Sprachquslität. ### 5/5 — Praktisch und einfach *2024-03-28, version 4.5* Sehr gute persönliche Betreuung. ### 3/5 — Fehlende Features *2023-05-11, version 4.2* Licht und Schatten. Es fehlen ein Anrufbeantworter, die Möglichkeit, SMS zu schreiben, sowie eine leicht verständliche, sekundengenaue Gebührenabrechnung. Außerdem meldet sich die iOS App manchmal mit Benachrichtigung-Popups, hinter denen keine Nachricht steckt. Im Großen und Ganzen aber sehr praktisch; und die Guthabenverzinsung ist einmalig. ### 5/5 — Liebe *2019-05-17, version 3.8* Der Dienst ist sehr nützlich, da er die Möglichkeit bietet, kostenlose Anrufe entgegenzunehmen. ### 5/5 — Vielen Dank *2019-05-17, version 3.8* Ich liebe es. Ich habe eine 95-jährige Schwester, jetzt kann ich mit ihr sprechen. Vielen Dank. Es bedeutet alles für mich ### 5/5 — Schön und einfach *2019-05-17, version 3.8* Ich werde dir ein Update von anderen Informationen über meine Erfahrungen mit dir schicken, ich werde zum Abendessen gehen und ich werde jetzt gehen. ### 5/5 — Love *2019-05-16, version 3.8* The service is very useful, because of the opportunity to receive free calls. ### 5/5 — Thank you *2019-05-16, version 3.8* I love it I have a 95-year-old sister now I can talk to her thank you very much. It means everything to me ### 5/5 — Nice and easy *2019-05-16, version 3.8* I will send you an update from other information about my experience with you, I will go to dinner and I will go now. ## Frequently asked questions about OpusTel ### What is OpusTel? OpusTel is a mobile application that allows users to make and receive secure VoIP calls using a real Swiss international telephone number. It focuses on providing a private and high-quality calling experience on iOS devices. ### Does OpusTel have ads? No, OpusTel does not contain advertisements. The app is free to download and use without any ad interruptions. ### What devices support OpusTel? OpusTel is available for iPhone, iPod, and iPad devices. It requires an internet connection via 5G/4G/3G/UMTS or Wi-Fi. ### How is the audio quality in OpusTel? OpusTel offers HD high-definition audio quality, utilizing the G722 and Opus codecs for clear and crisp sound during calls. ### Are incoming calls free with OpusTel? Yes, incoming calls to your OpusTel Swiss number are free of charge, meaning you will not incur any roaming costs. ### Can I record calls with OpusTel? Yes, OpusTel provides the ability to record both incoming and outgoing calls, which can be useful for record-keeping or reference. ### How often is OpusTel updated? The latest version of OpusTel is 5.5, and it was last updated on August 13, 2025. This indicates a commitment to ongoing development and improvements. ### What languages does OpusTel support? OpusTel automatically selects the language based on your device's settings, supporting 15 languages including English, German, Chinese, French, Spanish, and Italian. ## Version history (last 5 releases) ### 5.5 — 2025-08-13 Stability improvements ### 4.5 — 2023-11-03 Updated DFKS support Fixed audio quality issue when using the g722 codec Fixed issue where speaker staying enabled for incoming calls Fixed issue with missing quickdials Improved auto-answer form in settings Improved the behavior of the history removal feature ### 4.2 — 2021-11-01 Improved network handover behavior on call ### 3.9 — 2019-10-30 iOS 13 support and improved call setup in less than 1 second. ### 3.8 — 2019-01-16 Ios 12 support ## Apps similar to OpusTel | App | Rating | Price | Category | | --- | --- | --- | --- | | [AVOXI](https://appshunter.io/ios/app/avoxi/id1611033273) | 3.3 (7) | Free | Utilities | | [TalkTT - Call/SMS/Numbers/eSIM](https://appshunter.io/ios/app/talktt-callsmsnumbersesim/id990857196) | 4.7 (578) | Free | Utilities | | [Swiss Post](https://appshunter.io/ios/app/swiss-post/id378676700) | 4.7 (66) | Free | Utilities | | [sipcall](https://appshunter.io/ios/app/sipcall/id1501305137) | 4.0 (7) | Free | Utilities | | [swype: Flexible mobile plans](https://appshunter.io/ios/app/swype-flexible-mobile-plans/id1479174713) | 3.8 (46) | Free | Utilities | | [Call.com: 2nd Phone Number](https://appshunter.io/ios/app/callcom-2nd-phone-number/id6445892075) | 4.7 (645) | Free | Utilities | --- *Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-04.*