PaSS: Prefixer, SIM Selector & Spam Blocker

Stop thinking,

Start smart calling.


Automate your outgoing calls (Prefixes & optional SIM selection) and block unwanted callers locally. Works perfectly on single and Dual SIM devices.

Complete Call Management (In & Out)

Outgoing: Privacy & Automation

  • 🎭 Anonymous Calling: Call anonymously by default (e.g., #31#), except to your own contacts. Ideal for professionals. Read more
  • 📱 SIM Selection: Let the app automatically choose between work and private (if using Dual SIM). Read more
  • Smart Triggers: Use custom codes in a number to start rules with special actions. E.g., ### to call anonymously or *2* to select the work SIM.

Incoming: Local Spam Blocker & Focus

  • 🔒 Unwanted Callers: Instantly reject known spam, fraud, or hidden numbers without your phone ringing. Read more
  • 🌙 Focus & Rest: Automatically route work calls to voicemail during the weekend. Read more
  • 🌍 Number Ranges: Easily block entire regions or foreign series (e.g., +44800*).
  • Whitelist: Ensure important callers (your contacts) always get through safely.

100% Local & No Subscriptions

Your address book is never sent to an external server. All rules run safely on your own device. Try PaSS completely free for 30 days. Satisfied? Unlock the full app, or just incoming or outgoing, with a single one-time payment.

How it works

Your own rules determine what PaSS does

As soon as you make or receive a call, PaSS becomes active. PaSS checks your rules one by one. As soon as a rule matches, the actions you set in it are executed and PaSS stops again.

To help you get started, we have mapped out some scenarios to explain how PaSS works in more detail. You can create the rules yourself or download and import a number of examples.

How it works

The guide lists and describes all possible conditions and actions, allowing you to build your own custom rules so PaSS works exactly the way you want.

Guide
App Screenshot

Ready to take control?

Get it on Google Play