+421 is the country code for Slovakia.
Every phone number in Slovakia starts with +421 when you call it from another country. From the US, dial 011 421, then the number without its first 0.
- Time there
- Bratislava timeCentral European Time, UTC+1 to UTC+2
- From the US or Canada
- 011 421 912 123 456
- From the UK and most of Europe
- 00 421 912 123 456
- From Australia
- 0011 421 912 123 456
- From any mobile phone
- +421 912 123 456
- Inside Slovakia
- 0912 123 456
- Mobile numbers
- 9 digits after +421, starting 90, 91, 94 or 95
- Landlines
- 9 digits after +421, such as +421 2 XXX XXX XX in Bratislava
- Toll-free numbers
- Start with 0800
Check a +421 number to see whether it is a mobile, a landline or VoIP.
Pick the country, enter the number without the +421, and the free check shows whether it is valid and whether it is a mobile, a landline or VoIP.
Mobile numbers in Slovakia start with 9, and this table shows which networks first issued each start.
| At home | From abroad | First issued by |
|---|---|---|
| 090 | +421 90 | T-Mobile (Slovak Telekom), Orange |
| 091 | +421 91 | Orange, T-Mobile (Slovak Telekom) |
| 094 | +421 94 | Telefonica O2, BSG Estonia, Alternet, s.r.o. |
| 095 | +421 95 | 4ka of SWAN, Slovak Republic Railways (GSM-R) |
People keep their number when they switch networks, so the start shows where a number began. Our free number portability lookup shows the network it is on today.
25 landline areas cover Slovakia, from 02 in Bratislava to 057 in Humenne.
| At home | From abroad | Area |
|---|---|---|
| 02 | +421 2 | Bratislava |
| 06, 058 | +421 6, +421 58 | Roznava |
| 031 | +421 31 | Dunajska Streda |
| 032 | +421 32 | Trencin |
| 033 | +421 33 | Trnava |
| 034 | +421 34 | Senica |
| 035 | +421 35 | Nove Zamky |
| 036 | +421 36 | Levice |
| 037 | +421 37 | Nitra |
| 038 | +421 38 | Topolcany |
| 041 | +421 41 | Zilina |
| 042 | +421 42 | Povazska Bystrica |
| 043 | +421 43 | Martin |
| 044 | +421 44 | Liptovsky Mikulas |
| 045 | +421 45 | Zvolen |
| 046 | +421 46 | Prievidza |
| 047 | +421 47 | Lucenec |
| 048 | +421 48 | Banska Bystrica |
| 051 | +421 51 | Presov |
| 052 | +421 52 | Poprad |
| 053 | +421 53 | Spisska Nova Ves |
| 054 | +421 54 | Bardejov |
| 055 | +421 55 | Kosice |
| 056 | +421 56 | Michalovce |
| 057 | +421 57 | Humenne |
In Slovakia, the phone number format for apps and SMS gateways is +421 followed by the number without its 0.
| Written | Example | Where you see it |
|---|---|---|
| At home | 0912 123 456 | Business cards, local ads |
| International | +421 912 123 456 | Websites, email signatures |
| E.164 | +421912123456 | APIs, SMS gateways, CRMs |
A missed call from a +421 number you don't know can be a one-ring scam, so check it before calling back.
One-ring scams call once and hang up, hoping you call back a line that bills you international or premium rates.
- Don't call back an international number you don't know. A real caller leaves a message or sends a text.
- Check the number in the box above. A number that is not a working mobile or landline in Slovakia is a warning sign.
- Hang up on anyone who wants gift cards, crypto or a wire transfer, or asks you to read out a code that was just texted to you.
- Report it at reportfraud.ftc.gov, and see the FCC's guide to one-ring scams.
The codes next to +421 belong to other countries, so one wrong digit reaches a different place.
These are the questions people ask most about +421.
Which country uses the +421 country code?
Slovakia. Every phone number there starts with +421 when it is dialed from abroad.
How do I call Slovakia from the US?
Dial 011, then 421, then the number without its first 0. A mobile number written 0912 123 456 at home is dialed 011 421 912 123 456 from the US, or +421 912 123 456 from any mobile phone.
Is +421 the same as 00421?
Yes. 00 is the exit code used in Slovakia and most of the world, and the + on a mobile phone stands in for whatever exit code your network uses. From the US and Canada the exit code is 011 instead.
How many digits is a phone number in Slovakia?
A mobile number has 9 digits after +421, written 0912 123 456 at home. A landline has 9 digits, written 02 XXX XXX XX at home.
What time is it in Slovakia?
Slovakia is on Central European Time, UTC+1 in winter and UTC+2 in summer.
How do I check a +421 number that called me?
Enter it in the box above. The free check shows whether it is a valid number from Slovakia and whether it is a mobile, a landline or a VoIP line, which helps you spot a one-ring scam before you call back.
Sources: Google's libphonenumber numbering data for lengths, mobile starts, area code places, first-issuing networks and time zones, as of September 24, 2026; the ITU list of country codes.