PaSS: Prefixer, SIM Selector & Call Screener

Stop thinking,

Start smart calling.


The ultimate automation tool. Outgoing: Auto-select SIM & Prefixes. Incoming: Block, Silence, Voicemail or Allow.

Download on Google Play

One App, Two Functions

Outgoing: Prefixer & SIM Selector

  • Auto SIM: Automatically choose Work or Private SIM.
  • Smart Prefixes: Auto-add #31# (Hide) or country codes.
  • Corrections: Auto-remove +44 or strange characters.

Incoming: Privacy & Security Screener

  • Block: Automatically reject spam or unknown numbers.
  • 📼 Voicemail: Send non-urgent calls directly to voicemail.
  • 🔇 Silence: Let the phone ring, but without sound.
  • Allow: Ensure important calls (like family) always get through.

One Simple Rule Engine

PaSS works with rules you create. You build them easily using blocks. First, choose the conditions, then the actions. For both incoming and outgoing calls. PaSS then does exactly what you want. Stop thinking, just dial.

How it works

Top-to-Bottom Logic

When you make or receive a call, PaSS instantly scans through your rules.

PaSS checks line by line if the number meets your conditions. If it does, the actions for that rule are executed immediately: adding a prefix, removing characters, choosing a SIM, showing a notification, or silencing/blocking a call.

PaSS then stops; the remaining rules are ignored. You decide what happens, but never have to think about it again. Just dial!

Read the Full Guide

See it in Action

App Screenshot

Ready to take control?

Download on Google Play