# Phone-to-Zone

> Smart device interface for HTD Lync whole house audio systems. (iPhone/iPad app by Home Theater Direct, Inc..)

- Source: https://appshunter.io/ios/app/phone-to-zone/id1205430893 (this page in markdown: same URL + `.md`)
- Developer: [Home Theater Direct, Inc.](https://appshunter.io/developer/923050145)
- Category: Lifestyle, Utilities
- Price: Free
- Rating: 3.67/5 from 3 App Store ratings
- Age rating: 4+
- Requires: iOS 9.0 · 16 MB
- Languages: English
- Released: 2018-11-19
- Data updated: 2026-06-10
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/phone-to-zone/id1205430893/reviews.md

## What is Phone?

This app allows you to call into specific zones on your HTD Lync whole house audio system from your smart devices. The Phone-to-Zone Receive app is required on a device that is connected into the DI-21 Door Interface box with the Lync whole house audio controller.

NOTE: Lync V3 and DI-21 REQUIRED

## Key features

- Call into specific audio zones
- Smart device integration
- HTD Lync system control
- Requires DI-21 Door Interface
- Compatible with Lync V3


## Frequently asked questions about Phone

### What is Phone-to-Zone used for?

Phone-to-Zone allows you to call into specific zones of your HTD Lync whole house audio system directly from your smart devices. This enables remote control over your audio playback across different areas of your home.

### What hardware is required to use Phone-to-Zone?

To use Phone-to-Zone, you need an HTD Lync whole house audio controller and a DI-21 Door Interface box. The Phone-to-Zone Receive app must also be installed on a device connected to the DI-21.

### Is Phone-to-Zone compatible with older Lync versions?

Phone-to-Zone specifically requires Lync V3 and the DI-21 Door Interface box. It is not designed to work with older versions of the Lync system.

### What devices can I use Phone-to-Zone on?

Phone-to-Zone is available for iPhone, iPad, and iPod devices. It is designed to integrate with your existing smart devices for audio system control.

### How often is Phone-to-Zone updated?

The latest version of Phone-to-Zone is 1.1, which was last updated on April 19, 2019. The app was initially released on November 19, 2018.

### What is the age rating for Phone-to-Zone?

Phone-to-Zone has an age rating of 4+. This indicates it is suitable for users aged four and older.

### Does Phone-to-Zone have ads?

No, Phone-to-Zone does not contain advertisements. It is a free application with no in-app purchases or ads.

### What is the user rating for Phone-to-Zone?

Phone-to-Zone has an average rating of 3.7 stars, based on 3 user ratings. This feedback provides insight into user satisfaction with the application.

## Version history (last 3 releases)

### 1.1 — 2019-04-19

Updated DTMF Tones to eliminate the possibility of locking up the Lync Controller

### 1.0.1 — 2019-01-10

Added app URI

### 1.0 — 2018-11-19

No release notes.

## Apps similar to Phone

| App | Rating | Price | Category |
| --- | --- | --- | --- |
| [Granby Ranch](https://appshunter.io/ios/app/granby-ranch/id1535629733) | 5.0 (2) | Free | Lifestyle |
| [HS3Touch](https://appshunter.io/ios/app/hs3touch/id969613074) | 2.5 (27) | Free | Lifestyle |
| [Z-Tool+](https://appshunter.io/ios/app/z-tool-plus/id1018864080) | 2.3 (17) | Free | Lifestyle |
| [Sense Pro Square D Edition](https://appshunter.io/ios/app/sense-pro-square-d-edition/id1483773682) | — | Free | Lifestyle |
| [HSBuddy](https://appshunter.io/ios/app/hsbuddy/id1317682478) | 4.5 (25) | Free | Lifestyle |
| [The Crossing](https://appshunter.io/ios/app/the-crossing/id436071694) | 4.6 (8) | Free | Lifestyle |

## More apps by Home Theater Direct, Inc.

- [Valet Home Control](https://appshunter.io/ios/app/valet-home-control/id923050146)
- [HTD Lync](https://appshunter.io/ios/app/htd-lync/id1359212642)
- [HTD MC](https://appshunter.io/ios/app/htd-mc/id1386363507)
- [HTD Home Audio](https://appshunter.io/ios/app/htd-home-audio/id1632695603)

All apps by Home Theater Direct, Inc.: https://appshunter.io/developer/923050145

---

*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 2026-06-10.*