The +421 prefix belongs to Slovakia. If you got a call or text from a number starting with +421 (calling code 421), it came from Slovakia.
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Code
+421
ISO
SK
Region
Europe
Time zone
Europe/Bratislava
The +421 code identifies Slovakia on the international telephone network. Country code 421 is assigned to Slovakia under the ITU-T E.164 numbering plan, so any phone number that begins with +421 — written +421 or 00421 — is a Slovakia number.
Every Slovakia number in international format follows this shape — colour-coded so you can see where the country code ends and the local number begins.
When dialing Slovakia from abroad, the only fixed part is +421 — that's the country code. The rest depends on whether you're calling a mobile or landline number inside Slovakia.
+XXX XXX XXX XXX
Example: +421 912 123 456
+421 XX XXXX XXX
Include the area code if applicable. Omit any leading 0.
Enter the country code +421 when dialing Slovakia from abroad.
Add the local phone number (in most countries, drop the leading zero).
Use TwinPhone to connect the call at low per-minute rates.
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Example numbers for Slovakia:
Dialing codes immediately above and below +421 in the ITU plan — handy if you mistyped a digit or are dialing across a region.
Everything you need to know about TwinPhone.
The +421 code belongs to Slovakia. Any phone number that starts with +421 — or with 00421 — is a Slovakia number.
The 00421 prefix is Slovakia. The 00 is the international exit code dialed from Europe and many other regions; it is followed by +421, the Slovakia country code.
Dialing code 421 (dialed as +421 or 00421) belongs to Slovakia. Any phone number that starts with +421 is a Slovakia number.
Country code 421 is the ITU-T E.164 calling code for Slovakia. To call Slovakia from abroad, dial +421 followed by the national number.
The country code (international dialing code) for Slovakia is +421. To call Slovakia from abroad, dial +421 followed by the national number (in most countries, without its leading zero).
+421 is Slovakia's international country calling code under the ITU E.164 plan — often searched as the "421 area code". Any phone number starting with +421 is a Slovakia number.
From TwinPhone, just type +421 and the number — we connect it. From a landline, dial your exit code, then +421, then the number (in most countries, without the leading 0).
Slovakia's current local time is shown live on this page. Check it before calling so you reach people during waking hours.
Yes! Virtual numbers in Slovakia start at $1.60/month. Use it as your caller ID so people see a local number, or receive incoming calls directly in your browser.
Calling Slovakia with TwinPhone starts from $0.02/min, billed by the minute (rounded up to the next full minute). It is pay-as-you-go from your browser — no connection fee and no monthly fee. The exact per-minute price for +421 landlines and mobiles is shown live on this page.
Yes. TwinPhone works entirely in your web browser — Chrome, Edge, Safari, or Brave on desktop or mobile. There is no app to install and no SIM card: open the site, add credit, dial +421 and the Slovakia number, and the call connects.
A +421 number is not automatically a scam — +421 is simply the country code 421 assigned to Slovakia under ITU-T E.164, so the call or text came from Slovakia. If you do not know anyone there, treat an unexpected +421 call with the same caution as any unknown number: do not call back blindly and do not share personal details. Costs to call Slovakia are shown above.
Dial +421 with TwinPhone — no SIM, no app, right from your browser.
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