# Handy Contact Book — Support change phone number

> Converts 11-digit Vietnamese phone numbers to 10-digit format. (iPhone/iPad app by Kinh Tran.)

- Source: https://appshunter.io/ios/app/handy-contact-book/id1434227133 (this page in markdown: same URL + `.md`)
- Developer: [Kinh Tran](https://appshunter.io/developer/709170084)
- Category: Utilities, Productivity
- Price: Free
- Rating: 5.00/5 from 1 App Store ratings
- Age rating: 4+
- Requires: iOS 9.0 · 21 MB
- Languages: American English, Chinese (Simplified, China), Chinese (Traditional, Taiwan), Vietnamese
- Released: 2018-08-31
- Data updated: 2026-06-28
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/handy-contact-book/id1434227133/reviews.md

## What is Handy Contact Book?

All mobile phone number in Vietnamese that have 11-digits will force to 10-digits by 15th September this year.
In order to help you quickly convert bunch of phone number in your phone contact, we created this app for FREE.

## Key features

- Convert 11-digit to 10-digit Vietnamese numbers
- Batch phone number conversion
- Free utility tool
- Supports iPhone and iPod


## Frequently asked questions about Handy Contact Book

### What is Handy Contact Book used for?

Handy Contact Book is a utility app designed to help users convert 11-digit Vietnamese mobile phone numbers to the mandatory 10-digit format before the September 15th deadline.

### Is Handy Contact Book free to use?

Yes, Handy Contact Book is completely free to download and use. The app is provided at no cost to assist users with the phone number conversion.

### What devices does Handy Contact Book support?

Handy Contact Book is available for iPhone and iPod devices. It is designed to run on Apple's mobile operating systems.

### How often is Handy Contact Book updated?

The latest version of Handy Contact Book is 1.0.2, which was last updated on September 27, 2018. The app has not received updates since then.

### What is the age rating for Handy Contact Book?

Handy Contact Book has an age rating of 4+. This indicates it is suitable for users of all ages, with no content restrictions.

### Does Handy Contact Book have ads?

No, Handy Contact Book does not contain advertisements. The developer has chosen to provide this utility tool without any ads.

### What is the user sentiment for Handy Contact Book?

Based on the available data, Handy Contact Book has a perfect 5.0-star rating from one user review. This suggests a very positive initial reception.

## Version history (last 3 releases)

### 1.0.2 — 2018-09-27

- fix critical crash on some device

### 1.0.1 — 2018-09-25

- Fix bugs only change phone number in Vietnam
- Sort contact by Name.
- Fix bugs.

### 1.0 — 2018-08-29

No release notes.

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## More apps by Kinh Tran

- [Height and Distance](https://appshunter.io/ios/app/height-and-distance/id722926841)
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- [Price Note - for small business](https://appshunter.io/ios/app/price-note-for-small-business/id1009340186)
- [Activity Logging](https://appshunter.io/ios/app/activity-logging/id1090667802)
- [Slide Math](https://appshunter.io/ios/app/slide-math/id1177910407)
- [Random Selectors](https://appshunter.io/ios/app/random-selectors/id1204729397)

All apps by Kinh Tran: https://appshunter.io/developer/709170084

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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 2026-06-28.*