PrefixBlock: Spam Call Filter
Block entire number ranges
Only for iPhone
Free · In‑App Purchases · Designed for iPhone. Not verified for macOS.
iPhone
• 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
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
• Hard blocking is now the default: calls from blocked prefixes no longer ring. If you're on warn-only mode, the app asks once whether to switch.
• New: Check a number — paste the number that just called you to see if it's blocked, why it might still ring, and allow or block it right there.
• Spam text filtering now works from iOS 17.6, with a step-by-step setup guide.
• Texts from your allowed numbers no longer go to Junk.
• Setup instructions updated for iOS 18 and later; “Open Settings” goes straight to call blocking.
• Bug fixes and UI improvements.
The developer, Phung Doanh, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Phung Doanh
- Size
- 4 MB
- Category
- Utilities
- Compatibility
Requires iOS 17.6 or later.
- iPhone
Requires iOS 17.6 or later. - Mac
Requires macOS 14.6 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.3 or later.
- iPhone
- Languages
English and 16 more
- English, Arabic, French, German, Hindi, Indonesian, Italian, Japanese, Korean, Portuguese, Russian, Simplified Chinese, Spanish, Thai, Traditional Chinese, Turkish, Vietnamese
- Age Rating
4+
- 4+
- In-App Purchases
Yes
- Chặn đầu số trọn đời $9.99
- Chặn đầu số pro tháng $0.99
- Chặn đầu số pro năm $4.99
- Copyright
- © 2026 DatViet Inc