# PrefixPlus - add the prefix — add the prefix number to phone

> Utility to add custom prefixes to phone numbers in contacts. (iPhone/iPad app by yasuhiko nagahara.)

- Source: https://appshunter.io/ios/app/prefixplus-add-the-prefix/id1142430837 (this page in markdown: same URL + `.md`)
- Developer: [yasuhiko nagahara](https://appshunter.io/developer/1142430836)
- Category: Utilities, Productivity
- Price: Free
- Rating: 4.70/5 from 1,056 App Store ratings · 69 written reviews indexed
- Age rating: 4+
- Requires: iOS 15.6 · 8 MB
- Languages: American English, Japanese
- Released: 2016-09-06
- Data updated: 2026-08-21
- Monetization: ad-supported
- User reviews in markdown: https://appshunter.io/ios/app/prefixplus-add-the-prefix/id1142430837/reviews.md

## What is PrefixPlus?

PrefixPlus allows you to add the prefix number to phone numbers in Contacts at once.
Phone numbers with the prefix number will not be replaced but added to contacts.
For example, if you set the number "+81" and the label "Call(JP)", contacts will be updated as follows.

[Before update]
Home: 03-1234-5678
Mobile: 090-1234-5678

[After update]
Home: 03-1234-5678
Mobile: 090-1234-5678
Call(JP) Home: +81-3-1234-5678
Call(JP) Mobile: +81-90-1234-5678


(Caution)
Be sure to back up contacts as security against accidents. For example, if you back up to iCloud, you can restore contacts at some point in the past.
Please note that you can add prefix numbers to contacts synchronized with local, iCloud, Gmail only.

## Key features

- Add prefixes to multiple contacts at once
- Does not overwrite existing numbers
- Customizable prefix numbers
- Customizable label for new entries
- Supports iCloud and Gmail synchronized contacts

## What do users think of PrefixPlus?

Overall sentiment: positive

**Pros**

- 💡 Allows adding prefix numbers to contacts
- 🚀 Efficient batch update of contacts
- 👍 Convenient for users of MVNO services
- 👍 Integrates well with default phone app

**Cons**

- 🐛 Crashes or freezes when updating contacts
- 🐛 Inconsistent or incomplete contact updates
- 🔋 Potential for increased data usage or charges

**Commonly reported bugs**

- Crashes on iOS 13.3
- Duplicate contact entries created
- Prefix not applied to all contacts

**Most requested features**

- Option to add space between prefix and number
- Support for local/offline contacts
- Ability to selectively update contacts

## Recent user reviews (10 of 69)

All indexed reviews: https://appshunter.io/ios/app/prefixplus-add-the-prefix/id1142430837/reviews.md

### 5/5 — Good

*2025-11-27, version 25.0.0*

Good

### 1/5 — stupid app

*2025-10-25, version 25.0.0*

waiting to delete and cannot delete once you added

### 5/5 — Ok

*2025-04-01, version 8.0.0*

Good

### 5/5 — 一応

*2025-02-14, version 8.0.0*

上手くいった。

### 1/5 — 何度広告を見ても更新されない

*2024-06-08, version 8.0.0*

広告を何回見ても更新されない。
×印を押しても広告が消えず更新もされない。

### 5/5 — 素晴らしいプレフィックスの追加削除が出来る

*2024-06-07, version 8.0.0*

大概のアプリケーションは、プレフィックスの追加はできるが削除ができない。しかし、このアプリケーションはちゃんと削除することまで考えている完璧だ！

### 5/5 — good

*2023-10-14, version 7.0.2*

Testing to use

### 1/5 — Failed to do the task it was designed for

*2023-08-04, version 7.0.2*

It was supposed to add “+1” to all of my contacts. Instead it only added “1”. This means that I had to go through each contact and add the plus sign, which was the whole point of using this app.

### 5/5 — DCM

*2023-04-27, version 7.0.2*

OTf

### 5/5 — 秀逸なアプリケーションです。

*2023-04-03, version 7.0.2*

iij mioを数年前から使っており制限なしの通話を行うためにはプレフィックスをつける必要がありました。一括で登録してあるすべての連絡先に付与できるアプリケーションがないか調べていたところこちらが最適だと判断し、利用しました。動作は全く問題なく簡単に電話帳の連絡先にすべてプレフィックス付きの項目が付与されました。ちまちま300もの連絡先に付与することを考えたら効率が雲泥の差です。また、2023年3月からはiij mioはキャリアの発信でも話し放題が適応になりプレフィックスをつけると却って高額な通常料金になってしまうとのことで項目からも削除を行いましたが、これも一括で完了しました。秀逸すぎます。ありがとうございました！

## Frequently asked questions about PrefixPlus

### What does PrefixPlus do?

PrefixPlus allows you to add a custom prefix number to all your phone numbers within your contacts simultaneously. It creates new entries with the added prefix rather than overwriting your existing phone numbers, ensuring your original data remains intact.

### How does adding a prefix work?

You specify a prefix number (e.g., '+81' for Japan) and an optional label (e.g., 'Call(JP)'). The app then duplicates your existing phone numbers in contacts and prepends the specified prefix and label to these new entries, making it easy to dial with the correct international code.

### Is PrefixPlus free to use?

Yes, the app is free to use. It is supported by advertisements, which you will see within the application.

### What kind of contacts can be updated?

The app can add prefix numbers to contacts that are synchronized with local storage, iCloud, or Gmail. Contacts not synchronized through these methods may not be updated.

### What should I do before using PrefixPlus?

It is strongly recommended to back up your contacts before using PrefixPlus. This is a security measure against any accidental data loss. You can typically restore your contacts from a previous backup, such as one made with iCloud.

## Version history (last 5 releases)

### 26.0.1 — 2025-12-23

・Fixed an issue where deleting a prefix setting did not delete the corresponding contact.

### 25.0.0 — 2025-10-08

・Fixed an issue where contacts were not updating in iOS 25

### 8.0.0 — 2024-04-02

・Update for iOS17

### 7.0.2 — 2021-09-29

・Update for iOS15

### 6.4.0 — 2020-06-15

・Fixed the problem that "Update Contact" button was not activated when the network was a concern.

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## Related topics

[prefix dialer pro](https://appshunter.io/ios/topics/prefix-dialer-pro)

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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 2026-08-21.*