Call Firewall

For Android

You decide who can ring your phone.

Pick the states and countries you want to hear from. Calls from anywhere else are rejected before your phone rings.

  • $2.99, one time
  • No subscription
  • No ads
  • Android 10 or newer
Coming soon to Google Play

Rules you set, not a spam list

Most call blockers only catch numbers someone has already reported. Call Firewall works the other way round: you say where calls may come from.

Block by US state

Tick the states where your family and friends live. Every other state is blocked. Covers all 50 states and DC.

Block by country

One switch per country. Canada is identified by its area codes, so blocking Canada never blocks US numbers.

Block by prefix

Add any number prefix you want rejected, such as a single area code.

Keep who matters

Saved contacts always ring. The Allow List keeps any exact number ringing, whatever your other rules say.

Try it

Flip the switches the way you would in the app, and watch which calls would ring.

This demo needs JavaScript.

How it works

Setup takes a couple of minutes.

  1. Install and enableMake Call Firewall your phone's call-screening app.
  2. Set your rulesChoose the states, countries and numbers that may ring.
  3. Enjoy the quietOther calls are rejected, and you can see each one in Recently Blocked.

Private by design

Call Firewall has no Internet permission, so it cannot send your data anywhere.

  • No account or sign-in
  • No ads, analytics or tracking
  • No subscription
  • No access to your contacts or messages
  • No access to your microphone or location
  • Rules and history stay on your phone

Read the privacy policy

What it doesn't do

We would rather tell you now than have you find out later.

  • Your carrier may still send a blocked caller to voicemail. The call won't ring, but a voicemail can appear. An app can't control this.
  • Texts aren't filtered, and neither are calls in apps such as WhatsApp.
  • An area code shows where a number was issued, not where the caller is. Save people you know as contacts so they always ring.
  • Scammers can fake local numbers. A faked number from a state you allow will ring.
  • Calls with a hidden number usually can't be matched by a rule.
  • Android allows only one call-screening app at a time.

Questions

The quick answers. Ask the help chat below if yours isn't here.

How do I set it up?

Open the app and tap Enable Call Screening, then choose Call Firewall in Android's dialog. On Samsung it's labelled "Set as default Caller ID & spam app". The Protection card then says Active.

Next, set your rules. Every block rule starts switched off.

Will my contacts still ring?

Yes. Saved contacts always ring, even if they match a rule. Call Firewall doesn't have access to your contacts, so Android never hands it their calls.

A blocked caller still left a voicemail. Why?

The call was blocked: your phone didn't ring. But when an app rejects a call, the phone tells your carrier the line is busy, and many carriers send busy calls to voicemail. That happens in the carrier's network, so no app can stop it.

How does US state blocking work?

Tap Allow a State and tick every state that should keep ringing, then switch on Block US calls. Every other state is blocked.

Area codes show where a number was issued, not where the caller is, so save family members with out-of-state numbers as contacts.

What about 800 numbers?

Toll-free numbers (800, 833, 844, 855, 866, 877, 888) belong to no state, so state rules never block them. They have their own switch, off by default, because pharmacies, banks and delivery companies often use them.

A call I wanted was blocked. What do I do?

Open Blocking Activity on the main screen. Each blocked call shows the rule that stopped it. Tap Allow this number and that number will ring from now on.

Does it filter texts or WhatsApp calls?

No. Android only lets apps screen ordinary phone calls.

Is there an iPhone version?

No. Apple doesn't allow apps to block calls by area code or country, so Call Firewall is Android only.

How do refunds work?

Purchases and refunds are handled by Google Play, under Google's refund policy.

Need help?

Ask anything about Call Firewall. Answers come from an AI assistant that only knows about this app.

The help chat needs JavaScript. You can email support@archelm.co instead.

Messages are sent to Microsoft's Azure OpenAI service to write the answer, and aren't kept by us. Please don't include personal details or phone numbers. Still stuck? Email support@archelm.co.