Frequently Asked Questions

Absolutely. Many users miss the original Prefixer or similar outdated apps. PaSS is specifically built for modern Android versions (10+) and supports adding dial codes (like *31#) automatically.

Google tightened privacy rules in newer Android versions. PaSS is built from the ground up using official APIs, ensuring it remains secure and reliable without being blocked by the system.

Most SIM selectors do exactly one thing: choose a SIM card. PaSS is designed as a complete, automatic manager for all your phone calls. These are the main advantages:

• All-in-one: PaSS not only automatically selects the right SIM card, but also instantly adds prefixes (like #31#) and blocks incoming spam. One app for all your calling rules.
• 100% Privacy: Many modern calling apps send your address book to a cloud server. PaSS works entirely locally. Your contacts never leave your phone.
• Fully Automatic: Where other apps bother you with pop-ups to confirm choices, PaSS works silently in the background.
• Smart Triggers: Need to bypass your rules quickly? Type a custom code (like *2*) before a number. PaSS removes the code instantly and dials directly via the desired SIM.

Yes! You set a rule once (e.g., 'Always call Business group with SIM 2'), and the app automatically chooses the correct SIM in the background.

No, and it's not necessary. Android only allows one app at a time to act as the 'Call Redirection App'. PaSS includes all necessary features in one place to avoid conflicts.

Set Android to 'Hide number' by default. Then, create a rule in PaSS that adds the 'show number' prefix (like *31#) for specific contacts. You stay private, except for those you trust.

On some devices (like Oppo/ColorOS), the default Android setting must not be 'Always ask'. Please set a fixed default SIM (e.g., SIM 1) in your Android settings. PaSS will then seamlessly override this choice based on your rules!

No, PaSS works perfectly on single SIM devices. Many users use it solely as a local call firewall to block unknown numbers or as a prefixer for privacy.

With PaSS, you can set a default to call anonymously (prefix #31#), except for your contacts. Ideal for professionals who want to keep their private number hidden from clients.

Yes! This is a key feature many standard apps miss. With Focus Guard, you can set it so only people in your contact list can reach you, filtering out all other numbers and spammers.

Yes. With the built-in Focus Guard, you can instantly block incoming calls or send them to voicemail based on specific times and days.

You can link availability to your environment. For example, have PaSS ignore unknown numbers when connected to car Bluetooth, or switch to work SIM when office Wi-Fi is detected.

You can use wildcards in your spam list! Add a number and press the minus button (-) to replace the last digit with an asterisk (*). This easily blocks all numbers starting with a specific prefix (e.g., +44*).

Check the built-in History tab (at the bottom of the screen). If PaSS executed an action, the applied rule's name is shown right below the call. Click it to edit the rule instantly!

Yes! You can export your spam list from anywhere in the app via the top-right menu (⋮) as a .pspam file. Importing works via the same menu, or by simply clicking on a downloaded .pspam file. PaSS recognizes it and instantly imports the list locally on your phone.

Yes. Unlike many popular spam blockers, PaSS works 100% locally on your device. Your address book is never uploaded to a cloud or external server. You keep full control.

Absolutely not. PaSS only 'wakes up' for a fraction of a second during a call to perform the check and then returns to a passive state immediately.

Contacts access is needed to check groups for SIM selection. Calendar access allows Focus Guard to silence your phone during meetings. Everything stays 100% local.

This is an Android security requirement. To read the network name (SSID), location permissions are mandatory. Note: PaSS does not track or store your GPS location.

No, never. PaSS is built around privacy. All rules and call history are processed and stored 100% locally on your phone.

No. Try PaSS completely free for 30 days. After that, keep the app with a one-time purchase.