Cambodia country code, +855 explained.
Everything you need to call Cambodia with Twiching — full dialing format, step-by-step guide, and Tier-1 CLI routes that land every call.
Cambodia
Phnom Penh · Asia
· COUNTRY INFO · VERIFIED
ISO Alpha-2
KH
Capital
Phnom Penh
Region
Asia
Timezone
UTC+7
· DIALING GUIDE · VERIFIED
FULL DIAL FORMAT
011 · +855 · XX · XXXXXXX
How Cambodia numbers break down
A complete number to Cambodia 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 Cambodia.
AREA / MOBILE
Regional or mobile prefix — drop the leading 0.
LOCAL NUMBER
The subscriber's local number.
COMPLETE NUMBER FORMAT
011 · +855 · XX · XXXXXXX
Cambodia on the map
Phnom Penh · Asia
ROUTE
Tier-1 Direct
CLI
Verified
ASR
60%+ min
SIP trunking and local numbers for Cambodia
A Cambodia virtual number from Twiching plugs into SIP trunking, so an existing phone system can dial out with local +855 presence without swapping hardware or carriers.
Local +855 caller ID
Calls display a recognisable Cambodia 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.
+855
Cambodia · ready to provision today
Built for reliable delivery into Cambodia
Direct interconnects with Cellcard and the wider Cambodia network mean calls skip lower-tier wholesale transit entirely, on every call, not just high-volume routes.
Cambodia
+855
191
Countries in directory
CAMBODIA INCLUDED
99.97%
Call delivery rate
STIR/SHAKEN
500+
Carrier interconnects
TIER-1 DIRECT
60%+
Guaranteed ASR
REAL-TIME ROUTING
How Cambodia phone numbers are structured
Numbering Format
COUNTRY
+855
AREA
XX
LOCAL
XXXXXXX
Under country code +855, Cambodia numbers follow an open plan built from a 2-digit area or mobile prefix and a 7-digit subscriber line — 9 digits in all. A domestic "0" typically precedes the prefix, but that digit is dropped when dialing Cambodia internationally.
Carriers & language
3 major networks cover Cambodia (Cellcard, Smart Axiata, Metfone), against 60% internet penetration. VoIP is permitted and regulated by Ministry of Posts and Telecommunications (MPTC). Because Khmer is the primary language and KHR the local currency, both should inform IVR scripts, SMS content, and support hours.
Asia context
Asian markets range from fully liberalised to licensed-only VoIP, so compliant routing and correct local caller ID have an outsized effect on answer rates.
Skipping the exit code
Cambodia calls from the US need 011 first, then +855 — the exit code isn't optional.
Keeping the national trunk "0"
Cambodia numbers often show a domestic leading 0 — drop it once you've dialed the +855 country code from outside the country.
Ignoring the time difference
Cambodia runs on UTC+7. Check local hours before dialing so calls don't land outside business time.
Compliance, carriers & rates for Cambodia
Permitted — MPTC regulated
Regulated by Ministry of Posts and Telecommunications (MPTC)
Ministry of Posts and Telecommunications (MPTC) permits VoIP in Cambodia without special licensing for compliant operators, which keeps setup straightforward — no separate approval process stands between signing up and placing the first call.
- VoIP services require a concession or license issued by MPTC.
- Unauthorized international VoIP gateways are prohibited under telecom law.
- Operators must comply with lawful interception and data retention regulations.
Direct Tier-1 interconnect with Cellcard — no wholesale transit in between.
US → Cambodia
$0.018/min
Cambodia → US
$0.020/min
Billed per second, not rounded to the minute
How businesses use a Cambodia number
Phnom Penh-recognisable numbers
Callers in Phnom Penh and across Cambodia see a familiar +855 prefix rather than a number they don't recognise and won't pick up.
Asia outbound & support
Run sales and support lines into Cambodia over Tier-1 routes that interconnect with networks like Cellcard.
Time-zone-aware routing
Calls into Cambodia route to whichever team is on shift for UTC+7, instead of ringing a desk that's already gone home.
No local carrier contract needed
Entering Cambodia over SIP trunking skips the local carrier contract entirely — the number is provisioned and billed the same way as every other Twiching market.
FAQ
Calling Cambodia — frequently asked questions
Khmer is the primary language in Cambodia — IVR prompts, SMS copy, and support scripts should be written in it for the best response rates. Getting the greeting and menu options right in the local language is often the difference between a caller staying on the line or hanging up.
Calls from the US to Cambodia start at $0.018/min on Twiching, billed per second on Tier-1 routes. That's the same rate whether the call lands on a mobile or fixed-line number in the country.
Asian markets range from fully liberalised to licensed-only VoIP, so compliant routing and correct local caller ID have an outsized effect on answer rates. In Cambodia specifically, that's overseen by Ministry of Posts and Telecommunications (MPTC), which sets the compliance bar Twiching's routes are built to meet.
Calling Cambodia means dialing 011, then +855, instead of the domestic US format — plus accounting for the UTC+7 time difference. Domestic US calls skip both the exit code and the international country code entirely.
3 major networks serve Cambodia: Cellcard, Smart Axiata, Metfone. Twiching interconnects directly with these carriers over Tier-1 routes rather than relying on third-party transit.
Yes, where locally supported — a single Twiching Cambodia number can handle both voice calls and SMS. That avoids the overhead of provisioning and managing two separate numbers for one customer-facing line.
Full country code directory
Cambodia is one of several Asia markets Twiching covers — browse the rest of the directory below to compare dial codes, VoIP rules, and rates across the region. All 190 other countries are listed below, Asia first.
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Compliance with applicable regulations required.