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Slovakia +421

International code · Europe

How to dial

Calling from abroad +421 XXX XXX XXX

Dial +421, then the local number. Drop the leading trunk prefix 0. Generate the full number →

For domestic long distance dial 0 first, then the area code. Local calls: dial directly.

Mobile length
9 digits
Mobile prefixes
XXX XXX XXX
International format
+421 XXX XXX XXX
Domestic trunk
0

Sign-up availability

What to expect when signing up for these services with a physical SIM from this country:

ChatGPT Works
Claude Works
WhatsApp Works
Telegram Works
LINE Works
WeChat Works
X Works
TikTok Works
Gemini Works

Applies to every platform: VoIP / virtual numbers and heavily-reused number pools get rejected. Physical SIM only.

Checked 2026-09-12. Platform region policies and number-range allocations change — always confirm against each platform’s official supported-regions list and the carrier’s notices.
4 sources
help.openai.com/articles/7947663www.anthropic.com/supported-countriessupport.google.com/gemini?p=gemini_web_availabilitywww.mappr.co/tiktok-bans-by-country

How to read a number

+421905123456

+421Country code
Slovakia.
905Prefix
Slovak mobiles are written 09xx xxx xxx domestically. 905 is registered to Orange. Numbers are portable, so a range only tells you who it was first given to.
123456Remaining 6 digits
The subscriber number.
This section checked 2026-10-31.
3 sources
www.ezd.sk/dbpc/databazacisel.phpwww.itu.int/dms_pub/itu-t/oth/02/02/T02020000BD0003PDFE.pdfwww.teleoff.gov.sk/urad/odbory-oddelenia/odbor-legislativy-prava/pravne-normy/opatrenia-vyhlasky-uradu-regulaciu-elektronickych-komunikacii-postovych-sluzieb

Number ranges & quality

RangeTypeNotes
Starts with 09xx, 9 digits Mobile carrier Slovak mobiles are written 09xx xxx xxx domestically. Going through the regulator's database of allocated numbers and codes (7 October 2026) range by range: 0901–0904, 0910–0912 and 0914 are Slovak Telekom; 0905–0908, 0915–0919 and 0945 are Orange; 0940, 0944 and 0947–0949 are O2; 0950–0952 are SWAN (4ka); 0943 holds small blocks for a few service providers. Numbers are portable, so a range only tells you who it was first given to.
Starts with 0900 Other 0900 is premium-rate, not mobile — the database shows this range split among a crowd of value-added service providers.
Intl SMSStable
Virtual-number riskLow
ID requiredID is required; prepaid cards generally need real-name registration.

Physical SIMs can sign up without issues; prepaid cards need real-name registration.

Carriers & prefixes

Mobile prefixes by carrier.

Number portability applies — a prefix only shows the original carrier.

Porting rules in full

Numbers are portable; the details are in the regulator's Decree 431/2022, in force since 1 February 2023. By law, porting between fixed and mobile is not something operators have to offer. We couldn't find a current, quotable statement of deadlines or fees on the regulator's site, so they're not given here.

  • Orange Mobile carrier

    0905~0908, 0915~0919, 0945

    Ranges from the regulator's database of allocated numbers.

  • O2 Mobile carrier

    0940, 0944, 0947~0949

  • Telekom Mobile carrier

    0901~0904, 0910~0912, 0914

    Registered in the database as Slovak Telekom.

  • 4ka (SWAN) Mobile carrier

    0950~0952

    The fourth operator, registered in the database as SWAN, a.s.

This section checked 2026-10-17.
3 sources
www.ezd.sk/dbpc/databazacisel.phpwww.itu.int/dms_pub/itu-t/oth/02/02/T02020000BD0003PDFE.pdfwww.teleoff.gov.sk/urad/odbory-oddelenia/odbor-legislativy-prava/pravne-normy/opatrenia-vyhlasky-uradu-regulaciu-elektronickych-komunikacii-postovych-sluzieb

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Elsewhere in Europe