Czech Republic country code, +420 explained.
Everything you need to call Czech Republic with Twiching — full dialing format, step-by-step guide, and Tier-1 CLI routes that land every call.
Czech Republic
Prague · Europe
· COUNTRY INFO · VERIFIED
- ISO Alpha-2
- CZ
- Capital
- Prague
- Region
- Europe
- Timezone
- UTC+1
· DIALING GUIDE · VERIFIED
FULL DIAL FORMAT
011 · +420 · XX · XXXXXXXX
How Czech Republic numbers break down
A complete number to Czech Republic follows this pattern. Twiching adds the exit and country codes automatically when you dial from the app.
EXIT CODE
Dial from the US/Canada to leave the country.
COUNTRY CODE
Routes the call directly into Czech Republic.
AREA / MOBILE
Regional or mobile prefix — drop the leading 0.
LOCAL NUMBER
The subscriber's local number.
COMPLETE NUMBER FORMAT
011 · +420 · XX · XXXXXXXX
Czech Republic on the map
Prague · Europe
ROUTE
Tier-1 Direct
CLI
Verified
ASR
60%+ min
How to call Czech Republic
Click any step — watch the full dial string build piece by piece.
FULL NUMBER FORMAT
011 · +420 · XX · XXXXXXXX
Twiching automatically adds the exit and country codes — just enter the local number.
Czech Republic —
connected across every carrier.
191
Countries in directory
CZECH REPUBLIC INCLUDED
99.97%
Call delivery rate
STIR/SHAKEN
500+
Carrier interconnects
TIER-1 DIRECT
60%+
Guaranteed ASR
REAL-TIME ROUTING
Czech Republic
Europe · CZ
Czech Republic numbering plan & how to dial
Czech Republic uses an open numbering plan under country code +420. After the country code, a 2-digit area or mobile prefix is followed by a 8-digit subscriber number, giving a 10-digit national number. Domestic numbers are often written with a leading trunk "0" that is omitted when dialing Czech Republic from abroad.
Czech Republic has 88% internet penetration and is served by 3 major mobile networks (O2 Czech Republic, T-Mobile Czech Republic, Vodafone Czech Republic). VoIP is permitted and regulated by CTU (Czech Telecommunication Office). The local currency is CZK and the primary language is Czech, which shape IVR prompts, SMS content, and business-hours handling.
Most European numbering plans follow ITU-T E.164 with a national trunk prefix that is dropped for international dialing, and cross-border VoIP is widely supported across the region.
Skipping the exit code
From the US you must dial 011 before the +420 country code to reach Czech Republic.
Keeping the national trunk "0"
If a Czech Republic number is written with a leading 0 for domestic use, omit that 0 after the +420 country code when calling from abroad.
Ignoring the time difference
Czech Republic runs on UTC+1. Check local hours before dialing so calls don't land outside business time.
Permitted — CTU regulated
Regulated by CTU (Czech Telecommunication Office)
- VoIP providers must notify CTU and comply with the Electronic Communications Act No. 127/2005.
- Lawful interception obligations apply to all VoIP operators per Czech security legislation.
- Number portability is fully mandated for geographic and non-geographic VoIP numbers.
US → Czech Republic
$0.009/min
per minute
Czech Republic → US
$0.007/min
per minute
More in Europe
Business calling to Czech Republic
Local CZ caller ID
Present a Czech Republic +420 number so prospects in Prague and nationwide recognise the call and are more likely to answer.
Europe outbound & support
Run sales and support lines into Czech Republic over Tier-1 routes that interconnect with networks like O2 Czech Republic.
Follow-the-sun coverage
Staff Czech Republic hours (UTC+1) with routing that sends calls to the right team at the right local time.
FAQ
Calling Czech Republic — frequently asked questions
The country code for Czech Republic is +420. To call Czech Republic from the United States, dial 011, then 420, then the local number.
A full national Czech Republic number is 10 digits after the +420 country code — a 2-digit area or mobile prefix plus a 8-digit subscriber number.
Yes. VoIP is permitted in Czech Republic, regulated by CTU (Czech Telecommunication Office), so businesses can run cloud numbers and SIP termination on compliant routes.
Dial 011 (US exit code), then 420 (the Czech Republic country code), then the area or mobile prefix and subscriber number. Drop any leading domestic trunk 0.
The major networks in Czech Republic are O2 Czech Republic, T-Mobile Czech Republic, Vodafone Czech Republic. Twiching interconnects with Tier-1 carriers for direct delivery to these networks.
Twiching rates to Czech Republic start at $0.009/min per minute (and $0.007/min per minute from Czech Republic to the US), billed per second on Tier-1 routes.
Yes. Twiching provisions Czech Republic virtual numbers with local +420 caller ID for calls and, where supported, SMS — useful for sales, support, and building local market presence.
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