LineLayer for Android
LineLayer is an Android call-filtering app. Block numbers outside your contacts, keep allow and block lists, and see why a call was allowed or blocked — with clear rules you control, evaluated on your device.
App screenshot — home screen
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.
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.
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.
App screenshot — Expected Call Mode
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.
Call arrives
LineLayer checks your rules
Allow or block
Reason appears in your history
LineLayer is built around a local-first philosophy: call filtering decisions are designed to happen on your device, using rules you set, rather than relying on a large shared database of phone numbers.
Read about LineLayer privacy