Prefixer and SIM Selector

Stop thinking,

Start smart dialing


The ultimate automation tool. Perfect for Single SIM prefixing AND powerful Dual SIM management.

Download on Google Play

Two Powerful Solutions in One App

Prefix icon

✏️ Number Rewriting & Prefixes

Great on any phone. Automatically add prefixes (like *31# for anonymous), replace country codes, or remove characters before the call connects.

Dual SIM icon

🧠 Smart Dual SIM Control

Using two SIMs? Stop the "Which SIM?" pop-up. PaSS automatically selects the right SIM based on contacts, groups, or time of day.

Rule engine icon

⚙️ Powered by One Simple Rule Engine

Whether you want to just add a prefix, just pick a SIM, or combine both in complex scenarios: it's all powered by the same easy-to-use logic. Define conditions, add actions, and take control.

How it works

What is PaSS?

PaSS is a call redirector app. It sits silently in the background. When you dial a number, PaSS intercepts it, checks your rule list, and instantly applies the first rule that matches.

The 'First Match' Wins

This is the core logic: The app reads your rules from top to bottom. The very first rule in the list that matches the number you are dialing, 'wins'.

The app then stops, performs that one rule's actions (like adding a prefix OR choosing a SIM OR both), and skips the rest of the list. This means your rules should be ordered from most specific to most general.

See it in Action

Screenshot of PaSS main screen

Help & Downloads

Getting Started Guide

Want to see the full power of PaSS? Check out our complete guide. It explains every condition, action, and possibility.

Read the Complete Guide

Downloadable Example Rules

Import these rule sets (via the app menu) for a flying start:

Ready to take control of your calls?

Download on Google Play