Prefixer and SIM Selector

Stop thinking

Start smart calling


Your automatic prefix and Dual SIM manager.

Download on Google Play Store

Powerful Features, Simple Control

Dual SIM icon

🧠 Smart Dual SIM Management

Stop the "Which SIM?" pop-up. Assign contacts, contact groups (labels), or even unknown numbers to a specific SIM automatically.

Rule engine icon

⚙️ A Rule Engine for Everything

Combine conditions for ultimate control. Apply a rule only on workdays, between 9-to-5, or if the number starts with +44.

Prefix icon

✏️ Number Rewriting

Automatically add prefixes (like #31#), replace country codes, or remove characters. PaSS dials it.

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 of PaSS: 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 the actions for that single rule (rewrites the number, chooses the SIM), and skips the rest of the list. This means your rules should be ordered from most specific to most general.

See it in Action

Help & Downloads

Get Started

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 to get a flying start (via the app menu):