# Horizon: Collaborate on the go > Mobile IP telephone service for business communication and collaboration. (iPhone/iPad app by Gamma Telecom LTD.) - Source: https://appshunter.io/ios/app/horizon-collaborate-on-the-go/id1541325290 (this page in markdown: same URL + `.md`) - Developer: [Gamma Telecom LTD](https://appshunter.io/developer/445329272) - Category: Business, Productivity - Price: Free - Age rating: 4+ - Requires: iOS 15.0 · 44 MB - Languages: English - Released: 2022-07-21 - Data updated: 2026-06-11 - Monetization: free - User reviews in markdown: https://appshunter.io/ios/app/horizon-collaborate-on-the-go/id1541325290/reviews.md ## What is Horizon? The Horizon app allows you to communicate on the go, making and receiving calls using the Horizon IP telephone service from your Apple device. Designed with remote working and mobile users in mind, it keeps your business landline at your fingertips wherever you are working from. In addition, the app can provide presence, instant messaging, and conferencing enabling you to collaborate better with colleagues and contacts at your convenience. Note: A Horizon account enabled for the iOS soft client is required to use the app. Please contact your Horizon Service Provider for details. ## Key features - Make and receive IP calls - Business landline on mobile - Presence indicators - Instant messaging - Conferencing capabilities - Remote work support ## Recent user reviews (10 of 69) All indexed reviews: https://appshunter.io/ios/app/horizon-collaborate-on-the-go/id1541325290/reviews.md ### 1/5 — Logs you out poor app *2025-11-25, version 2.7.1* It keeps logging out and bugging really poor quality especially as we run this for an emergency telephone line ### 1/5 — Pointless app *2025-11-04, version 2.7.1* Theres always some sort of issue with. It’s never straightforward. ### 1/5 — Useless *2025-10-20, version 2.7.1* Constantly having to uninstall and reinstall. It hardly ever rings or gives a notification when someone is calling. The only time I know someone has tried to call is when I open the app and see a list of missed calls or if I’ve received an angry email saying no one is responding! Looks like it’s been neglected and doesn’t get updated anymore which is absolutely useless in a world that relies on technology. Glad to see they value their customers. ### 1/5 — Call dropping *2025-10-17, version 2.7.1* Call dropping, the app doesn’t let me see my dialled calls it throws me out the app, constant issues - app needs updating ASAP with the latest updates in line with the phone updates ### 1/5 — Absolutely useless *2025-09-11, version 2.7.1* Where do I begin… the app is so unreliable. I often don’t receive notifications for incoming calls, and when opening the app I suddenly see a list of missed calls. Calls regularly disconnect even with full 5G/wifi coverage after just a couple of minutes. The voicemail function doesn’t work at all, as the app crashes every time I try to access it. It is impossible to get real support to resolve the issues, which leaves leaving a review as the only option. The app hasn’t had an update in over a year, which goes to show how little they actually care about user experience. If anyone is thinking of using Gamma or Horizon, DONT USE THEM ### 1/5 — Terrible app *2025-08-01, version 2.7.1* This app simply isn't fit for purpose. I miss so many incoming calls simply because the app doesn't work properly. ### 1/5 — Avoid *2025-06-22, version 2.7.1* We have used this app to support our out of hours service within a reactive business. This is managed through a third party. This app does not work correctly. We have had constant issues with calls not connecting, clients not being able to hear from our end and emergency jobs being missed due to the reliability of the app actually allowing calls through or sending notifications. ### 1/5 — Rubbish *2025-05-27, version 2.7.1* It continually lets us down, it either doesn’t connect or the signal is really bad. VOIP is the future and this app fails miserably! ### 1/5 — In fit for purpose *2025-03-28, version 2.7.1* High price and some days it just doesn’t work. ### 1/5 — Crash crash crash *2025-02-13, version 2.7.1* The app keeps crashing. It started saying my password was incorrect. I reset my password and tried to log on again. The app can’t cope with the request, it only deletes one character at the time (of the insanely long password, which I can not personalize!!!!). There’s a delay in ‘backspace’ to ‘action’. Once the field is finally empty and I try to enter the new password, the app freezes and shuts down. This app should not exist, Skype in 2001 worked better. ## Frequently asked questions about Horizon ### What does the Horizon app do? The Horizon app allows you to use your business IP telephone service from your Apple device. It enables you to make and receive calls, manage your presence, send instant messages, and participate in conferences, keeping your business line accessible wherever you are. ### What are the key features of the Horizon app? Key features include making and receiving calls using your Horizon IP telephone service, providing your business landline on your mobile. It also offers presence indicators, instant messaging for quick communication, and conferencing to collaborate with colleagues and contacts. ### Is the Horizon app free to use? The application itself is free to download and use. However, a Horizon account enabled for the iOS soft client is required to operate the app. You will need to contact your Horizon Service Provider for details on account setup and any associated service costs. ### Who is the target audience for this app? This app is designed for remote working professionals and mobile users who need to stay connected with their business landline. It's ideal for individuals and teams who require seamless communication and collaboration tools while on the go. ### What is required to use the Horizon app? To use the Horizon app, you must have a Horizon account that is enabled for the iOS soft client. This is not a standalone service; it requires an active subscription or service from a Horizon Service Provider. Contact your provider for setup and access information. ## Version history (last 5 releases) ### 2.7.1 — 2024-01-08 Fixed a bug where tapping on a call log on iOS call history would not call the number in the client ### 2.7.0 — 2023-12-05 Features Ability to bulk delete Voicemail messages Enable use of iOS Password autofill Bug Fixes Fix to prevent Speaker from being turned off when call is taken off hold Fix to prevent a user from entering multiple room calls within the same room Fix to handle leaving the Room whilst a Room Call is still active Fix to show messages sent in Rooms between two Mobile users Fix to dynamically show messages that have been received whilst user has been on the User Profile screen ### 2.6.12 — 2023-11-14 Remove support for iOS 14 Added the option to choose audio output for visual voicemail Deleting visual voicemails will now ask for confirmation Bug fixes and improvements for rooms Fixed an issue with searching for users with spaces Fixed an issue where a user could not disable call forwarding Various bug fixes and performance improvements ### 2.6.11 — 2023-10-03 Added participants list and active speakers for rooms calls Improvements for call history Added personal directory contacts in search results Fixed an issue on iOS 17 where incoming calls answered when the app is killed would not work correctly Added meeting presence state Bug fixes and improvements ### 2.6.10 — 2023-08-09 Fix for calls dropping on EE network Added a loading animation to search screens Bug fixes and improvements ## Apps similar to Horizon | App | Rating | Price | Category | | --- | --- | --- | --- | | [Xero Me](https://appshunter.io/ios/app/xero-me/id991901494) | 4.7 (102) | Free | Business | | [Credas](https://appshunter.io/ios/app/credas/id1231930028) | 4.5 (3,506) | Free | Business | ## More apps by Gamma Telecom LTD - [Inbound](https://appshunter.io/ios/app/inbound/id445329269) - [OMNi](https://appshunter.io/ios/app/omni/id698171691) - [Business Continuity](https://appshunter.io/ios/app/business-continuity/id820968867) - [Horizon Smartphone App](https://appshunter.io/ios/app/horizon-smartphone-app/id933224195) - [SIP Trunk Call Manager](https://appshunter.io/ios/app/sip-trunk-call-manager/id1065446436) - [CircleLoop](https://appshunter.io/ios/app/circleloop/id1120683212) All apps by Gamma Telecom LTD: https://appshunter.io/developer/445329272 ## Related topics [collabora](https://appshunter.io/ios/topics/collabora) --- *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 2026-06-11.*