How to Block International Spam Calls on Android
Getting a wave of calls from + country codes you've never dealt with? You can stop international spam on Android — either by filtering every foreign number or by blocking a whole country-code prefix.
International scam calls — including the "one ring" (wangiri) trick that hangs up to bait a costly callback — usually come from numbers you've never seen, often spoofed. Blocking them one by one is hopeless. Here are the approaches that actually work, and where Android's built-in tools fall short.
Why international spam is so persistent
Scam operations dial enormous volumes from overseas and constantly change numbers, so a normal blocklist never catches up. A common scam is wangiri: a single ring from a foreign number, hoping you'll call back a premium-rate line. The safest rule is simple — don't call back unknown international numbers, and stop them from ringing in the first place.
What Android's built-in blocking can and can't do
Block a specific number
Stock Android lets you block individual numbers after they call — useful, but useless against spam that uses a fresh number every time.
Block by country code
Most stock Android builds have no built-in way to block an entire country-code prefix; you'd have to block each number. Some manufacturers add limited prefix options, but coverage is inconsistent — which is why people turn to a call-screening app for reliable prefix and "not in contacts" filtering.
Three reliable ways to stop international spam
1. Block everything not in your contacts (simplest)
If you don't expect calls from numbers you haven't saved, the cleanest fix is to block or silence every number not in your contacts. This wipes out foreign spam and domestic spam at once. See our guide to blocking unknown callers.
2. Filter all international numbers
If you want local unknown calls to ring but foreign ones to stop, filter numbers that begin with an international prefix (+ or 00). Block Unknown Callers can narrow its filtering to international numbers specifically, so domestic calls are unaffected.
3. Block a specific country-code prefix
Plagued by one particular country code? Add that prefix (for example, the calls all starting with the same + code) to the block list so every number under it is rejected — without blocking the rest of the world.
Set it up in about a minute
- Install the app Get Block Unknown Callers from Google Play — free, no sign-up, no contacts access.
- Set it as your call-screening app Confirm the role in the system dialog.
- Pick your rule Block everything not in your contacts, or narrow it to international numbers, and choose Block or Silence.
- Use prefixes for exceptions Allow a country code you do business with, or block the specific prefix that's spamming you, using the allow and block lists.
Will I miss legitimate international calls?
Several safety nets keep the calls you want:
- Contacts always ring — save the numbers and people you expect calls from abroad.
- Allow list by prefix — permit a whole country code you regularly deal with while blocking the rest.
- Repeat-call bypass — an urgent caller who tries again quickly is let through.
- Silence instead of Block — keep foreign calls in your log to review rather than rejecting them outright.
Free · No sign-up · No contacts access
Frequently asked questions
Can I block calls by country code on Android?
Stock Android usually can't block a whole country-code prefix on its own — it blocks one number at a time. A call-screening app can block by prefix, so every number under a country code is rejected.
How do I stop "one ring" (wangiri) scam calls?
Don't call the number back. Block calls that aren't in your contacts, or filter international numbers, so the one-ring calls stop reaching you. Calling back is exactly what the scam wants.
Can I block all international calls but keep local ones?
Yes. Filter numbers that start with an international prefix (+ or 00) while letting domestic calls ring. You can still allow specific country codes you trust.
Does this need access to my contacts?
No. Android matches your contacts internally, so the app filters foreign and unknown numbers without ever requesting contacts permission.
Should I answer calls from unknown international numbers?
Generally no. If it's important, the caller will usually leave a message or be someone you can save to contacts. Returning unknown international calls can be costly.