FAQ — JSS CallBlocker

General Questions

Does JSS CallBlocker have ads? No. The app is ad‑free and requires only a one‑time purchase for Premium features.
What Android version do I need? Android 10 or later is recommended for the best experience.
Do I need an internet connection? No. Core call blocking works offline. Internet is needed only for installing and optional backup sync destinations (if used).

How do I block unknown callers? Enable Block Unknown from Settings (Premium feature). Unknown means numbers not in your Contacts.
How do I block anonymous/private numbers? Enable Block Anonymous from Settings (Premium feature).
Can I import recent calls into my lists? Yes. Tap Import on the main screen to pull numbers from your call log. Use the Known Contacts toggle to switch between contacts and unknown callers.
Can I block by prefix? Yes. Add a partial number (e.g., 224) to block common spam ranges.

What’s included in Premium? Unlimited whitelist/blacklist sizes, and the ability to block Unknown and Anonymous callers.
Is Premium a subscription? No. It is a one‑time purchase. No recurring fees and no ads.
How do I test purchases? Join the closed test track and enable license testing as described on the Tester Onboarding page.

Where are my contacts and call logs stored? On your device. They are used locally to match callers and to populate your lists.
What gets backed up? Your lists are included in encrypted backups. Hit counters are not restored so stats start fresh after a restore.
Where can I read the full policy? See our Privacy Policy.

Last updated 2025-08-18