mathematics

Telephone numbers in Cambodia

Telephone numbers in Cambodia is a mathematics topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Telephone numbers in Cambodia rather than just read about it. In short: Cambodia's telephone numbering plan is managed by the National Broadcasting and Telecommunications Commission (NBTC) in accordance with International Telecommunication Union's (ITU) recommendation E.164. International Calls International Access Codes are also used to select the operator.

Key takeaways

Telephone numbers in Cambodia belongs to mathematics; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Telephone numbers in Cambodia to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Telephone numbers in Cambodia from memory before moving on to harder problems.

Reference excerpt

Cambodia's telephone numbering plan is managed by the National Broadcasting and Telecommunications Commission (NBTC) in accordance with International Telecommunication Union's (ITU) recommendation E.164.

International Calls International Access Codes are also used to select the operator. All are starting with 00, while the third number is identifying the operator's gateway. Currently there are 3 active codes:

Gateway 1 (MPTC or Telecom Cambodia) - 001 Gateway 2 (Royal Telecam International) - 007 VoIP Gateway - 008 All other combinations are reserved for this purpose only.

Lines To dial a landline all over the country in Cambodia, the format is Area Code + Phone Number. The area code is 3 digits long, followed by a 6- or 7-digit phone number. Calls made from outside Cambodia must omit the prefix 0. Therefore, to call a landline number in Phnom Penh from other countries, dialing begins with +855 23, followed by 6 or 7 digits.

Area code

Area codes starting with 02

Phnom Penh - 023 Kandal - 024 Kampong Speu - 025 Kampong Chhnang - 026 Area codes starting with 03

Takeo - 032 Kampot - 033 Sihanoukville - 034 Koh Kong - 035 Kep - 036 Area codes starting with 04

Kampong Cham - 042 Prey Veng - 043 Svay Rieng - 044 Tbong Khmum - 045 Area codes starting with 05

Pursat - 052 Battambang - 053 Banteay Meanchey - 054 Pailin - 055 Area codes starting with 06

Kampong Thom - 062 Siem Reap - 063 Preah Vihear - 064 Oddar Meanchey - 065 Area codes starting with 07

Kratie - 072 Mondulkiri - 073 Stung Treng - 074 Ratanakiri - 075 Likewise, to call mobile phones from landlines or other mobile phones, domestic dialing begins with a 0 followed by 8 or 9 digits. Mobile numbers in Cambodia take the form: 0TT-AXX-XXXY. The first two numbers after the leading 0 or 'TT' in the example above identify the operator. For example, 010 234 567 is an example of a 9-digit mobile number from Smart. 088 234 5678, on the other hand, is an example of a 10-digit mobile number from Metfone. The 3rd digit after the leading 0 or 'A' in the example above must be between 1 and 9. Normally this value is between 2 and 9, which allows a value of '1' to be used for mobile phones that are roaming in Cambodia. However, some operators, such as Metfone, are using a '1' in this range to extend their number ranges for certain popular prefixes. For example, 012 123 4567 and 092 123 456 are valid mobile numbers in Cambodia. 'X' can take the values 0 to 9, and 'Y' is an optional extra digit that is used by some operators. Most mobile numbers are 8 digits long (excluding the leading 0); however, some operators are now using 9-digit numbers. 088 234 5678 is an example of a valid 9-digit mobile number. Calling from outside Cambodia requires the omission of the leading 0. Therefore, to call Cambodian mobile numbers from other countries, dialing begins with +855, followed by the operator prefix without its leading zero and the subscriber digits. Valid international forms include +855 10, +855 15, +855 69, +855 81, +855 88, or full numbers such as +855 92 662 075 and +855 97 234 5678, depending on the carrier and number length. In addition to mobile services, several VoIP and digital telecommunication providers in Cambodia now operate under prefixes such as 010, 012, and 097, integrating with existing mobile numbering rules. These numbers follow the same domestic and international dialing requirements, ensuring compatibility across Cambodia’s telecommunications network. As the Telecommunication Regulator of Cambodia (TRC) continues expanding the national numbering plan, operators may introduce new prefixes or modify existing allocations. However, all new ranges remain consistent with the 0TT-AXX-XXX/Y format and conform to the same dialing conventions both within Cambodia and from abroad.

Illustrations

Worked examples

Example 1 — a first encounter with Telephone numbers in Cambodia

Start with the simplest possible case. Write down what Telephone numbers in Cambodia claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In mathematics, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Telephone numbers in Cambodia before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Telephone numbers in Cambodia ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Telephone numbers in Cambodia

In research: Telephone numbers in Cambodia appears in mathematics research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Telephone numbers in Cambodia in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Telephone numbers in Cambodia is common in secondary-school and first-year university syllabi. It links to neighbouring topics Cambodia communications-related lists, Telecommunications in Cambodia, Telephone numbers by country, so understanding it makes those chapters shorter.
In everyday life: Look for Telephone numbers in Cambodia outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Telephone numbers in Cambodia in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Telephone numbers in Cambodia means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Telephone numbers in Cambodia out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Telephone numbers in Cambodia in simple terms?

Why does Telephone numbers in Cambodia matter?

Because it connects several mathematics ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Telephone numbers in Cambodia?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Telephone numbers in Cambodia.