Spam Fortress - Call Blocker

River Technologies LLC

In-app purchases

About this app

Most call blockers make you block spam one number at a time. Spam Fortress blocks by area code instead — stop hundreds of unwanted calls at once, without ever touching your contacts.

HOW IT WORKS
- Block entire area codes at once — no need to block numbers one by one
- Or flip it around: only allow specific area codes through, block everything else
- Block individual phone numbers directly
- Trusted Callers mode — only your contacts get through, everyone else is blocked
- Block calls with no Caller ID (unknown/restricted numbers), with a clear warning about emergency callback considerations before you turn it on
- Optional schedule — only block during the hours you choose
- Quick Add — instantly add known spam-heavy area codes (toll-free ranges, high-risk international prefixes) to your block list

YOUR CONTACTS ARE ALWAYS PROTECTED
No matter what mode you're using, people in your contacts always get through. Spam Fortress never blocks someone you actually know.

BUILT FOR PRIVACY, NOT DATA COLLECTION
- 100% on-device — nothing is ever uploaded, tracked, or sold
- No analytics, no ads, no third-party sharing
- No account or sign-in required
- No access to your call log — screening happens entirely through Android's built-in call-screening system

PRO FEATURES
- Unlimited blocked numbers and area codes
- Extended call history
- Custom sound for blocked-call notifications
- Back up and restore your block lists to a file
- Call statistics dashboard
- Priority scheduling and spam-code presets

Free tier includes everything you need to get started: 3 blocked area codes, 5 blocked numbers, and 25 entries of call history — no credit card, no trial, no pressure.

Spam Fortress blocks unwanted calls the way call-blocking should work: quietly, privately, and entirely under your control.

What’s new

A major visual redesign with a brand-new app icon and refreshed navigation. Added the ability to block calls with no Caller ID (with a clear warning about emergency callback risk before enabling). Fixed settings that could reset themselves after rotating your phone or switching tabs. Fixed several scheduling bugs, including overnight schedules being rejected incorrectly. Bug fixes and stability improvements throughout.