phones Country calling codes · EN / 中文
🇨🇿

Czech Republic +420

International code · Europe

How to dial

Calling from abroad +420 XXX XXX XXX

Dial +420, then the local number. Generate the full number →

No trunk prefix — dial local and long distance numbers directly.

Mobile length
9 digits
Mobile prefixes
XXX XXX XXX
International format
+420 XXX XXX XXX
Domestic trunk
(none)

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

+420603123456

+420Country code
Czech Republic.
603Prefix
Czech mobile numbers are 9 digits with no leading 0. 603 is registered to T-Mobile. Numbers are portable, so a range only shows who it was first given to.
123456Remaining 6 digits
The subscriber number.

Dialled domestically as these 9 digits; there is no trunk prefix.

This section checked 2026-10-31.
3 sources
ctu.gov.cz/vyhledavaci-databaze/pridelena-cisla-a-kodyctu.gov.cz/informace-pro-ucastniky-o-sluzbe-preneseni-telefonniho-cislactu.gov.cz/1/download/cislovaci-plan-verejnych-telefonnich-siti_1114435245.pdf

Number ranges & quality

RangeTypeNotes
60x / 70x / 72x / 73x / 77x / 79x（共 9 位） Mobile carrier Czech mobile numbers are 9 digits with no leading 0. ČTÚ's database of allocated numbers and codes holds 800 mobile range records: T-Mobile has 603/604/605 and 73x, O2 has 601/602/606/607 and 720, Vodafone has 608 and 771/773–776/778; 77x and 79x also contain many small MVNO blocks. Numbers are portable, so a range only shows who it was first given to
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

You keep your number when you switch; available since 2006 (Electronic Communications Act 127/2005, with the details set by ČTÚ in a general measure). Numbers cannot move between fixed and mobile. So the ranges below only tell you who a block was originally allocated to.

  • T-Mobile Mobile carrier

    603~605, 730~736, 738, 739

    Owner: Deutsche Telekom AG

  • O2 Mobile carrier

    601, 602, 606, 607, 720, 790, 794

    Owner: PPF

  • Vodafone Mobile carrier

    608, 771, 773~776, 778

    Owner: Vodafone Group plc

  • Tesco Mobile MVNO
    Host network: O2
  • GoMobil MVNO
    Host network: T-Mobile
This section checked 2026-10-14.
3 sources
ctu.gov.cz/vyhledavaci-databaze/pridelena-cisla-a-kodyctu.gov.cz/informace-pro-ucastniky-o-sluzbe-preneseni-telefonniho-cislactu.gov.cz/1/download/cislovaci-plan-verejnych-telefonnich-siti_1114435245.pdf

Community tips

No community tips yet. We refresh every 1–2 months — contributions welcome.

Have experience to share? Submit →

Other countries

Elsewhere in Europe