Block unwanted calls with rules you write

For calls from numbers not in your contacts. Calls from your contacts aren't screened; they ring as normal.

For Android 10 and later. No account and no internet permission.

Decline's Home screen under the headline "Your phone. Your rules.": a lit porch lamp, "Protection on", 3 calls blocked, a Test a number button and recent calls marked Rejected, Allowed and Silenced.

Decline is a call blocker for Android 10 and later. It uses Android's call screening role to check each call from a number not in your contacts against rules you write: block and allow lists, starts with, ends with, contains and simple patterns. Matching calls are rejected or silenced. It has no spam database and no internet permission.

Your rules, in plain words

Add a block rule for one number, or for every number that starts with, ends with or contains some digits. Patterns go further: * stands for any run of digits and ? for exactly one, so 1800??????? covers 1800 followed by seven digits. An allow rule beats any block rule, so one number can still ring.

Block the number that is exactly 12025550147

Block and allow lists: exact numbers you never want to hear from, or want to ring no matter what.
Block numbers that start with 1888

One rule for a whole series, such as numbers starting 1888. Ends with and contains work the same way.
Block numbers that match 1800???????

A pattern: * is any run of digits, ? is one digit. This one means 1800 and seven more digits.
Allow numbers that end with 9876543210

An allow rule beats any block rule, so this number rings even if a block rule covers it.

Solid plates are block rules, outlined plates are allow rules, as in the app. Numbers on this page are examples.

Test a number before you trust it

Type any number into the test box and Decline runs it through the same check live screening uses. It lists each rule it tried, in order, whether that rule matched, and the result with its reason, such as "Matched rule: Numbers starting 1800, 11 digits long". You see what a rule does before a real call arrives.

Number to test 18005551234

1 800-555-1234 Rejected

Matched rule: Numbers starting 1800, 11 digits long

Digits checked: 18005551234

Rules tested, in evaluation order

Is exactly 15550030000Allow no match
Numbers starting 1800, 11 digits longBlock matches

The test box from the app, redrawn with its demo numbers.

Every decision has a reason

Every call Decline screens goes into its log with the number, the time, the result and the rule or mode that decided it. Tap an entry to allow or block that number. Blocked calls can also show a notification, silent by default, with an Allow button that lets that number ring from then on.

The fix on offer is the opposite of what happened: a stopped call offers Allow this number, and a call that rang offers Block this number.

Decline's Log under "Wrong number? One tap fixes it": a rejected call opened to show the rule that stopped it, with Allow this number and Block buttons.

Reject or silence, your choice

Pick one action for blocked calls in Settings. Reject declines the call before the phone rings, and your phone's call history still lists it. Silence lets the call come in without ringing. Two switches go further: block hidden numbers, and block every number that no allow rule covers.

Block hidden numbers: Calls that arrive with no number, shown as hidden or private.
Block all unknown numbers: Every call that shows a number and isn't covered by an allow rule. It doesn't catch hidden callers, so turn on both to stop both kinds.

1 800-555-1234Rejected

Declined before the phone rings.
1 800-555-0188Silenced

The call comes in, but the phone doesn't ring.
1 555-003-0000Allowed

No rule or mode stopped it, so it rang.

Nothing leaves your phone

Decline doesn't request Android's internet permission, so it can't send anything off your phone. It has no account, ads, analytics or crash reporting. It doesn't read your contacts, call history or messages. Your rules, settings and call log stay in the app's private storage, and Android backup is turned off for it.

Read the privacy policy

Internet permission: Not requested
Contacts, call history, messages: Not read
Account, ads, analytics: None
Android backup: Turned off

What Decline doesn't do

It doesn't use a spam database or look up who's calling. It only knows your rules.
It doesn't screen calls from your contacts; Android sends them straight through.
It doesn't read or block text messages.
It has no quiet hours or schedules.
It doesn't change numbers for country codes, so check prefixes in the test box. How country codes work