# PrefixBlock: Spam Call Filter — Block entire number ranges

> Block entire number ranges (iPhone/iPad app by Phung Doanh.)

- Source: https://appshunter.io/ios/app/prefixblock-spam-call-filter/id6800204952 (this page in markdown: same URL + `.md`)
- Developer: [Phung Doanh](https://appshunter.io/developer/965062916)
- Category: Utilities
- Price: Free with in-app purchases
- Age rating: 4+
- Requires: iOS 17.6 · 4 MB
- Languages: American English, Arabic, French (France), German (Germany), Hindi, Indonesian, Italian, Japanese, Korean, Brazilian Portuguese and 7 more
- Released: 2026-08-21
- Data updated: 2026-09-21
- User reviews in markdown: https://appshunter.io/ios/app/prefixblock-spam-call-filter/id6800204952/reviews.md

## What is PrefixBlock?

• 17 languages and 69 countries — block prefixes at home and abroad

Chặn Đầu Số identifies and warns you about spam calls and texts by prefix. When a number from a prefix you added calls, the app shows a "Spam" label right on your screen.

Other apps only block one number at a time — block this one, they call from the next. Chặn Đầu Số works differently: you block the whole prefix (024899, for example) and the app covers every number starting with it. Spam operations buy numbers in bulk blocks, so blocking by prefix hits them at the source.

Key features:
• Block calls by landline prefix — 024 (Hanoi), 028 (Ho Chi Minh City) and more
• Filter spam SMS from those same prefixes too
• Quick-block suggestions for the most common telesales prefixes — one tap
• "Warn only" mode — show a label instead of hard-blocking, your choice
• Bilingual Vietnamese / English, switch right inside the app

Privacy first:
• Does NOT read or upload your contacts
• NO ads, NO tracking
• Your block list stays on your device

Free for up to 500,000 numbers. Upgrade to Premium (monthly / yearly / lifetime) to block without limits.

Note: iOS handles blocking silently, and it does not block numbers saved in your Contacts.

Terms of Use: https://phungdoanh.github.io/term.html
Privacy Policy: https://phungdoanh.github.io/privacy_policy.html

## Pricing and in-app purchases

Base price: Free.

**Subscriptions**

| Subscription | Price | Period |
| --- | --- | --- |
| Chặn đầu số pro tháng | $0.99 | per month |
| Chặn đầu số pro năm | $4.99 | per year |

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Chặn đầu số trọn đời | $9.99 | one-time |



## Version history (last 5 releases)

### 1.5 — 2026-09-14

- Fix bugs

### 1.4 — 2026-09-11

• Incremental loading: adding, removing or toggling a prefix now updates only what changed — no more reloading the whole list.
• Premium: cover up to 8 million numbers (was 1 million) and 5-digit prefixes (1 million numbers each).
• Progress bar for large lists; confirmation before switching mode on a large list.
• Minor fixes.

### 1.2 — 2026-09-08

• Back up and share your prefix list — move it to a new phone, or send it to someone
• Import a list by pasting text
• Changing the language no longer kicks you out of the screen you were on

### 1.1 — 2026-09-08

• 17 languages — switch instantly, no restart needed
• 69 countries: block foreign prefixes without leaving your own
• New design: protection status card and a cleaner 3-tab layout
• Edit a saved prefix by tapping its row
• Accent-free country search
• Replay the intro any time from Settings
• Fixed the SMS spam filter not working
• Fixed the block list being lost after a device restart

### 1.0 — 2026-08-21

No release notes.

## More apps by Phung Doanh

- [Tu dien y hoc](https://appshunter.io/ios/app/tu-dien-y-hoc/id972978909)
- [Lịch Vạn Niên 2026 - Lịch Âm](https://appshunter.io/ios/app/lich-van-nien-2026-lich-am/id980481486)
- [Tu dien thuoc](https://appshunter.io/ios/app/tu-dien-thuoc/id981221461)
- [Drugs Dictionary Offline](https://appshunter.io/ios/app/drugs-dictionary-offline/id993103146)
- [Ultimate Guide for Terraria Pro - Tips and cheats for Terraria](https://appshunter.io/ios/app/ultimate-guide-for-terraria-pro-tips-and-cheats-for-terraria/id995019416)
- [Diseases Dictionary Offline](https://appshunter.io/ios/app/diseases-dictionary-offline/id1000731232)

All apps by Phung Doanh: https://appshunter.io/developer/965062916

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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 2026-09-21.*