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
Czech Republic virtual phone numbers, built for business
Instead of leasing a physical line in Czech Republic, a Twiching SIP trunk routes your existing PBX or softphone traffic through a local +420 number — same call quality, none of the on-the-ground infrastructure.
Local +420 caller ID
Calls display a recognisable Czech Republic number instead of an unfamiliar international one.
SIP trunking
Route your existing PBX or softphone through Twiching's Tier-1 trunk — no hardware swap.
Minutes to provision
Numbers activate in the dashboard the same day, with no on-the-ground carrier contract.
+420
Czech Republic · ready to provision today
Tier-1 delivery into Czech Republic, end to end
Direct interconnects with O2 Czech Republic and the wider Czech Republic network mean calls skip lower-tier wholesale transit entirely, on every call, not just high-volume routes.
Czech Republic
+420
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
How Czech Republic phone numbers are structured
Numbering Format
COUNTRY
+420
AREA
XX
LOCAL
XXXXXXXX
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.
Carriers & language
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.
Europe context
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"
That leading 0 on a Czech Republic number is for domestic calls only; leave it out when dialing in after +420.
Ignoring the time difference
Before dialing Czech Republic, check the local clock — it runs on UTC+1, and off-hours calls tend to go unanswered.
Compliance, carriers & rates for Czech Republic
Permitted — CTU regulated
Regulated by CTU (Czech Telecommunication Office)
Czech Republic's regulatory posture under CTU (Czech Telecommunication Office) is permissive toward VoIP, meaning a business can start calling and texting into the country without a separate compliance process.
- 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.
Direct Tier-1 interconnect with O2 Czech Republic — no wholesale transit in between.
US → Czech Republic
$0.009/min
Czech Republic → US
$0.007/min
Billed per second, not rounded to the minute
How businesses use a Czech Republic number
Prague-recognisable numbers
Callers in Prague and across Czech Republic see a familiar +420 prefix rather than a number they don't recognise and won't pick up.
Sales & support in one line
The same Czech Republic number handles inbound support and outbound sales calls, both landing on Tier-1 routes into O2 Czech Republic and the wider network.
Time-zone-aware routing
Calls into Czech Republic route to whichever team is on shift for UTC+1, instead of ringing a desk that's already gone home.
SIP trunking for market entry
Stand up a Czech Republic presence on SIP trunking before committing to local infrastructure — the same number scales from a pilot to full local hiring.
FAQ
Calling Czech Republic — frequently asked questions
Czech Republic's local currency is CZK, which is worth factoring into any pricing or invoicing shown to customers there. Twiching's own per-minute rates to and from Czech Republic are quoted in USD regardless of the local currency.
No — Czech Republic isn't part of the NANP. It has its own country code, +420, under the international E.164 numbering system, which is why calls from the US need the 011 exit code first.
Twiching rates to Czech Republic start at $0.009/min, and calls back from Czech Republic to the US start at $0.007/min. Both directions are billed per second rather than rounded up to the nearest minute, on Tier-1 routes throughout.
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 — that digit is only used for calls placed from inside Czech Republic itself.
Czech Republic is in Europe. 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.
Yes — Czech Republic numbers include a 2-digit area or mobile prefix before the subscriber number. That prefix is what routes the call to the right regional or mobile network once it arrives in the country.
Full country code directory
Europe is fully covered in Twiching's 191-country directory. Jump to any of the markets below for the same level of detail shown on this Czech Republic page. All 190 other countries are listed below, Europe first.
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