# GBA-400+

> Connects compatible CASIO watches to iPhone for enhanced mobile link functions. (iPhone/iPad app by CASIO COMPUTER CO., LTD..)

- Source: https://appshunter.io/ios/app/gba-400-plus/id1483704854 (this page in markdown: same URL + `.md`)
- Developer: [CASIO COMPUTER CO., LTD.](https://appshunter.io/developer/456569836)
- Category: Utilities, Lifestyle
- Price: Free
- Rating: 3.40/5 from 10 App Store ratings · 44 written reviews indexed
- Age rating: 4+
- Requires: iOS 11.0 · 23 MB
- Languages: Russian, American English, Arabic, European Spanish, Italian, Korean, German (Germany), European Portuguese, Chinese (Traditional, Taiwan), Chinese (Simplified, China) and 2 more
- Released: 2020-02-16
- Data updated: 2026-08-26
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/gba-400-plus/id1483704854/reviews.md

## What is GBA?

●Description
This is the basic application for connecting and communicating with a Bluetooth(R) v4.0 enabled CASIO watch.
Pairing your watch with an iPhone enables use of a variety of different Mobile Link functions that greatly enhance the iPhone experience. 
The GBA-400+ app also simplifies certain watch operations by letting you perform them on your phone screen. 

Visit the website below for details.
http://world.g-shock.com/

We recommend using GBA-400+ on the following operating systems.
Operation is not guaranteed for any operating system not listed below.
Even if an operating system has been confirmed as compatible, software updates or display specifications may prevent proper display and/or operation.

⋅ iOS 12 or later.

Applicable Watches:  GBA-400

Please refer to the FAQ link below to resolve problems such as being unable to connect or operate the watch.
https://support.casio.com/en/support/faqlist.php?cid=009001019

This application uses location information to obtain accurate time.
For "Location Service" in iPhone privacy settings, please "Always". If it is not "Always", the application will not work properly.
Continued use of GPS running in the background can dramatically decrease battery life.

## Key features

- Bluetooth v4.0 connectivity
- Mobile Link functions
- Simplified watch operations via phone
- Accurate time synchronization
- iPhone integration

## Recent user reviews (10 of 44)

All indexed reviews: https://appshunter.io/ios/app/gba-400-plus/id1483704854/reviews.md

### 1/5 — Needs to be removed, the app died along with the watch. Remember to stay away from connected g shock

*2026-07-02*

Don’t ever buy a g shock with software or Bluetooth that needs maintenance

### 1/5 — NOT WORKING

*2026-04-15*

This app doesn’t seem to work anymore - sort it out Casio!

### 1/5 — Not Working

*2025-04-28*

The app was designed for iOS 11 and hasn’t been updated in at least 4 years (sometime around 2021, give or take some months). As I write this, we’re up to iOS 18.4.1; while the app does launch, it fails to pair every time with the G-Shock “G’Mix” GBA-400 watch. The app will detect the watch when the watch is in setup mode (the mode after the countdown timer) and you hold down the connect button for about a half-second, but it fails to pair every time. Attempts to pair with the watch in any other mode will fail with the app not even getting as far as detecting the watch. I wish I could say I was surprised, but we are talking about a watch that a) requires a separate app when Casio is merging their watches of all brands to use one app, b) only had 11 models, and c) was discontinued in 2015. So if you have a GBA-400, it’s a nice historical artifact but don’t expect the music player controls to work. It will otherwise function the same as its physical counterpart, the GA-400, which shares the same case and strap design and has a nearly-identical digital-analog face right down to the hour and minute hand designs, but has a simpler module with no Bluetooth or music player functions. So as much as I can’t really blame Casio for not updating an orphan app for an orphan watch, the app is useless without an update to run on current versions of iOS - it now deserves zero stars, but one is the minimum.

### 1/5 — Not able to connect with newer phone anymore

*2024-08-01*

As title

### 5/5 — Casio g-shock gba-400

*2024-04-01*

Отличное приложение , нашел информацию как сбросить часы  от другого телефона и подключил к новому владельцу . Все супер , сразу подключились, и управление через родное приложение музыка работает на все 5 баллов , а так же все остальные настройки работают отлично. Спасибо Casio.

### 1/5 — Please update this app

*2023-11-04*

Pause button skip btuttons the old style Gmix please update this app gshock is gshock that’s forever please update for the gshock Gmix thank you

### 5/5 — 挺好的，一般清楚配对信息就能连接

*2023-03-08*

好用

### 1/5 — App not working in IOS

*2023-01-11*

Play pause next and previous track option not working when triggered from gba 400+ Watch model please fix the

### 1/5 — Connectivity issues

*2022-07-27*

unable to connect watch with ios device

### 1/5 — 连接失败

*2022-06-23*

不管怎么试都是失败 算了

## Frequently asked questions about GBA

### What watches are compatible with GBA-400+?

The GBA-400+ app is specifically designed for the CASIO GBA-400 watch model. Ensure you have this model to utilize the app's features.

### What operating systems does GBA-400+ support?

GBA-400+ is recommended for iOS 12 or later. Operation is not guaranteed on operating systems not listed, and updates or display specifications may affect performance even on compatible systems.

### Why does GBA-400+ need location information?

The application uses location information to obtain accurate time. For this to function correctly, you must set 'Location Service' in your iPhone's privacy settings to 'Always'.

### Can GBA-400+ be used offline?

The core functionality of GBA-400+ relies on Bluetooth connectivity to a compatible CASIO watch. While some watch functions may operate independently, the mobile link features require an active connection.

### How often is GBA-400+ updated?

The latest version of GBA-400+ is 1.0.1, which was last updated on August 17, 2020. Future updates will depend on CASIO's development schedule.

### What is the user sentiment for GBA-400+?

GBA-400+ has an average rating of 3.7 stars from 9 ratings. This suggests a mixed user reception, with some users finding it useful and others potentially experiencing issues.

### Does GBA-400+ have ads?

No, GBA-400+ does not contain advertisements. The app is free to download and use without interruptions from ads.

### Where can I find help for connection issues with GBA-400+?

For problems such as being unable to connect or operate the watch, please refer to the FAQ link provided by CASIO: https://support.casio.com/en/support/faqlist.php?cid=009001019

## Version history (last 2 releases)

### 1.0.1 — 2020-08-17

Stability improved, minor bugs eliminated.

### 1.0 — 2020-02-17

No release notes.

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## More apps by CASIO COMPUTER CO., LTD.

- [EXILIM Remote](https://appshunter.io/ios/app/exilim-remote/id640856022)
- [Chordana Tap](https://appshunter.io/ios/app/chordana-tap/id675014142)
- [Chordana Viewer](https://appshunter.io/ios/app/chordana-viewer/id711042441)
- [CASIO WATCH+](https://appshunter.io/ios/app/casio-watch-plus/id760165998)
- [EXILIM Link](https://appshunter.io/ios/app/exilim-link/id904148679)
- [C-Assist](https://appshunter.io/ios/app/c-assist/id906611059)

All apps by CASIO COMPUTER CO., LTD.: https://appshunter.io/developer/456569836

## Related topics

[g-shock connected app for gbw-5000](https://appshunter.io/ios/topics/g-shock-connected-app-for-gbw-5000) · [casio g shock app](https://appshunter.io/ios/topics/casio-g-shock-app) · [g shock](https://appshunter.io/ios/topics/g-shock) · [casio g shock](https://appshunter.io/ios/topics/casio-g-shock)

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*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 2026-08-26.*