Cambodia phone code +855: mobile format & how to dial

Key facts

International code+855

International format+855 XX XXX XXXX

Mobile prefixesXX XXX XXXX

Mobile length9 digits

Domestic trunk0

Number ranges & quality

Range	Type	Notes
`XX XXX XXXX`	Mobile carrier	Physical carrier ranges (see Mobile prefixes / length above). Always use a physical SIM — MVNO and data-only ranges are frequently rejected by platforms.

Intl SMSStable

Virtual-number riskLow

ID requiredRegistration is mandatory (all SIMs recorded in a national database since February 2023); foreigners use a passport, Smart’s online registration includes a face scan, max 5 Smart SIMs per ID.

Physical SIMs can sign up without issues; foreign visitors usually need to register with a passport.

Carriers & prefixes

Mobile prefixes by carrier.

First draft — not yet verified item by item

Number portability status unverified.

Metfone Mobile carrier

Owner: Viettel Cambodia
Smart Mobile carrier

Owner: Axiata Group Berhad
Cellcard Mobile carrier

Owner: The Royal Group

This section checked 2026-09-13. Sources: en.wikipedia.org/wiki/List_of_mobile_network_operators_in_Asia_and_Oceania

SIM cards & keeping a number

Cambodian SIMs must be registered: since February 2023 the law requires every SIM to be recorded in the Ministry of Posts and Telecommunications’ national database, and the regulator (TRC) requires ID checks before activation, with unregistered or multi-identity SIMs to be deactivated (Light Reading, May 2024). Foreigners use a passport.

Prepaid validity comes from top-ups, and the window to restore expired credit is short (only 7 days at Smart), so these SIMs aren’t suited to keeping a number long-term from abroad.

Smart prepaid

Local prepaid

Network: Smart Axiata’s own network (MNO)
Price: Official top-up table: $1.5 = 8 days, $2 = 15 days, $4 or $5 = 30 days, $6 = 35 days, $10 = 70 days, $20 = 100 days
Keeping the number: Smart terms: top-up funds are valid for a set active period and expire unused at the end; top up within 7 days of expiry to restore them. How long after expiry the number is deactivated isn’t stated in the terms (third-party reports say 90 days)
ID check: Official site: scan an original passport or Cambodian ID plus a face scan (eKYC), or visit a Smart Shop; max 5 Smart SIMs per ID; mismatched details can mean a 14-day suspension
SMS & calls: A normal Cambodian number. Official SmartRoam page: China is covered (US$10 spend-cap tier); dial *1700*313# to turn on roaming. The cost of receiving SMS in China isn’t listed

Pros

Official table shows exactly how long each top-up lasts
Foreigners can register online with a passport scan and face scan

Watch out

The largest top-up ($20) lasts 100 days; expired credit can’t be restored after 7 days
How long until the number is deactivated isn’t officially stated

Where to buy: smart.com.kh

Sources: www.smart.com.kh/about/terms-and-conditions · www.smart.com.kh/sim-registration · www.smart.com.kh/sim-guidelines · www.smart.com.kh/services/smartroam · www.lightreading.com/regulatory-politics/cambodian-telco-watchdog-warns-against-sale-of-unregistered-sim-cards · cambodiaexpatsonline.com/ask-the-expats-questions-answers/when-will-smart-sim-card-expire-t22761.html

Cellcard prepaid

Local prepaid

Network: Cellcard’s own network (MNO)
Price: SIM and top-up amounts vary
Keeping the number: Cellcard terms: prepaid main balance is valid for the active period and expires after it; top up within 180 days of expiry to restore it. How long until the number is recycled isn’t stated
ID check: ID registration under TRC rules; foreigners use a passport
SMS & calls: A normal Cambodian number; cost of receiving SMS while roaming in China not verified

Pros

Expired balance restorable within 180 days — more forgiving than Smart

Watch out

Number recycling period not officially stated
Roaming SMS pricing not verified

Where to buy: cellcard.com.kh

Sources: www.cellcard.com.kh/en/terms-conditions · www.lightreading.com/regulatory-politics/cambodian-telco-watchdog-warns-against-sale-of-unregistered-sim-cards

From user and blogger reports; platform risk rules change often — treat as a guide only. This section checked 2026-09-15.

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

Jump to another country

Calling Cambodia from abroad

Dial +855, then the local number. Drop the leading trunk prefix 0.

Generate the full number →

Dialing within Cambodia

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

Elsewhere in Asia

Community tips

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Common premise & disclaimer

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.

Sources：help.openai.com/articles/7947663 · www.anthropic.com/supported-countries · support.google.com/gemini?p=gemini_web_availability · www.mappr.co/tiktok-bans-by-country/

Cambodia +855