Frequently Asked Questions (FAQ)

Yes, absolutely. While outdated apps (like the old Prefixer by 253below) often no longer work on newer Android versions (Android 10+), PaSS offers a modern, safe, and 100% local solution. You can not only add dial codes, but you also get a powerful Dual SIM manager. Read more about automatic prefixes and anonymous calling.

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 (like Multi Sim Selector) do exactly one thing: they pick 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 chooses the right SIM card, but also directly adds prefixes (like *67) 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 quickly deviate from your rules? Type a custom code (like *2*) before a number. PaSS instantly removes the code and calls directly via the desired SIM.

Discover all possibilities on our Dual SIM management page.

Definitely! In PaSS, you can easily set up call rules that automatically add the correct country code or prefix depending on the number you are calling or the contact group. This makes it an ideal and secure alternative to apps like intlprefix or Call Prefix, especially if you travel frequently or have international contacts. Everything happens seamlessly in the background.

Yes! This is one of the main features. You set up a rule in PaSS once (for example: 'Always call the Business group with SIM 2'). From that moment on, the app automatically chooses the correct SIM completely in the background. Read more about this on our Dual SIM management page.

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 your standard Android setting to 'Hide number'. Then, create a rule in PaSS that automatically adds the 'show number' code (like *82) as a prefix for specific contacts. This way, you call privately, except to people you trust! Discover all possibilities on our Prefix & Anonymous calling page.

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 *67), except for your contacts. Ideal for professionals who want to keep their private number hidden from clients.

Yes, this is one of the most requested features. With your own rules, you can set it so that only people from your contact list can reach you. All other numbers are immediately filtered, without your address book ever leaving your phone. You can find more details on our page about the local spam filter.

Yes. You can directly reject or silence incoming calls based on specific days, times, or even specific words in your calendar (like 'vacation' or 'off'). Additionally, you can add certain contact groups as exceptions so they can still reach you. Read all about it on our special Smart DND (Do Not Disturb) page.

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.