LineLayer for Android
Block calls with rules you control, check public reported activity, and let Smart Protection automatically handle strong matches. LineLayer also keeps a clear history of why calls were allowed or blocked.
Delivery drivers, clinics, employers, technicians, and other legitimate callers often use numbers that aren't saved in your contacts. A filter that blocks everything unfamiliar can block them too.
LineLayer gives you explicit control instead of pretending every unknown number can automatically be identified. You decide the rules — and you can always see why a call was allowed or blocked.
Android phones don't all define "unknown" the same way, either — see how call-blocking terms differ across Android phones.
Filter calls from numbers you haven't saved. This is a broad rule, so LineLayer also gives you ways to make room for legitimate callers who fall outside your contact list — like allow lists and Expected Call Mode.
Check public reported activity for incoming numbers. LineLayer Pro can automatically handle strong reported-activity matches — a report isn't proof of spam or fraud, and coverage varies by country.
Keep an explicit list of numbers you always want to let through, and a separate list of numbers you never want to hear from. Rules you set take priority over broader filters.
Set rules to block calls originating from specific countries, based on the criteria you configure — useful if you don't expect calls from certain regions.
Legitimate callers with something urgent often call back quickly. LineLayer accounts for repeat calls in a short window so genuinely urgent contact attempts aren't treated the same as a single blocked call.
Every filtered call is logged with the reason it was allowed or blocked, so your rules stay transparent instead of feeling like a black box.
Call filtering is designed around local processing on your device rather than depending on a massive shared caller-ID database.
A note on private and hidden callers: Android's call-screening role — the mechanism LineLayer uses to apply rules before a call rings — does not receive calls whose presentation is restricted, unknown, unavailable, or payphone. In practice, LineLayer's rules reliably apply to calls Android makes eligible for screening — primarily visible numbers, including ones not in your contacts — not a guarantee of blocking every private or hidden call. See private, hidden, and unknown calls for the full explanation.
Turn on Expected Call Mode to temporarily relax your relevant filtering rules while you're waiting for a legitimate call from a number you don't recognize — like a callback from a clinic or a delivery driver on their way.
Once it's off, your normal rules apply again.
This is meant for a specific call you're expecting; for the general rule it temporarily relaxes, see the practical options for blocking numbers outside your contacts.
A call arrives
LineLayer evaluates your rules and, when applicable, reported-activity context
Allow or block — Smart Protection Pro can automatically handle strong reported-activity matches
Reason appears in your history
LineLayer's core rule-based filtering stays local-first: contact-based rules and allow/block lists are evaluated on your device, using rules you set, rather than a large shared database of phone numbers.
When contact-based rules are enabled, LineLayer uses Contacts permission on your device to check whether a visible incoming number is already saved in your contacts — not to upload contacts or build a caller-ID database.
Reported-activity checks work differently: they use a bundled FTC Do Not Call snapshot and run on-device, comparing an incoming number against that local dataset — not your contacts — so they don't change what LineLayer uploads or stores. LineLayer Learn also publishes a broader public lookup using FTC and FCC data that you can browse directly.
Read about LineLayer privacy
LineLayer
