mathematics

Telephone numbers in Vietnam

Telephone numbers in Vietnam 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 Vietnam rather than just read about it. In short: Vietnam's telephone country code is 84. The country is divided into many regions with individual area codes for landlines, as well as a separate format for mobile telephone numbers.

Key takeaways

Telephone numbers in Vietnam 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 Vietnam to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Telephone numbers in Vietnam from memory before moving on to harder problems.

Reference excerpt

Vietnam's telephone country code is 84. The country is divided into many regions with individual area codes for landlines, as well as a separate format for mobile telephone numbers. The five emergency telephone numbers are 111 (child protection), 112 (lifesaving services), 113 (police), 114 (fire), and 115 (first aid).

Land lines Land line telephone numbers in Vietnam follow the format area code + subscriber number'. The area codes depend on the province or city. To dial a number within the same province or city, only the subscriber number is dialed. When dialing from a different province/city or from a mobile phone, the dialing format is 0 + area code + subscriber number. Area codes may have from two to three digits, while subscriber numbers may have from seven to eight digits, in total, the land line telephone numbers have 10 digits.

Area codes

Area code 69 69 is the special area code dedicated for the Ministry of Defence (Vietnam) and the Ministry of Public Security (Vietnam).

Mobile telephone numbers In Vietnam, mobile phone numbers follow the format 09x-xxxxxxx or new prefixes: 03x, 05x, 07x, 08x.

The first 0 is the trunk code. The next two digits (3x, 5x, 7x, 8x or 9x) specify the mobile phone operator. Some mobile phone operators have been given more than one operator code.

In Circular No. 22/2014/TT-BTTTT dated 22 December 2014, all 11-digit mobile phone numbers will be changed into 10-digit numbers, the Ministry of Information and Communications announced in a recent press release. All 11-digit numbers with prefixes '012' of VinaPhone and MobiFone, '016' of Viettel, '018' of Vietnamobile and '019' of GMobile will be converted into 10-digit ones. To minimize possible loss of communications before, during and after network code change, each stage must consist of four steps as follows:

Make public announcement at least 60 days before the network code change starts. Take technical measures to enable simultaneous dialing for 60 days since the network code change starts. Example: users may dial old or new network code 0986888888 to Viettel. Maintain the notification sound (since the time of simultaneous dialing closes). During this time, any call using new network codes shall be normally processed and any call using old network codes shall be routed to the notification sound. Stop maintaining the notification sound: Calls shall be successful processed only through new network codes. To ensure changing of network codes is quick and favorable for businesses and service users, steps aforementioned should be implemented for one stage. In Communication of 31.V.2018 the Ministry of Information and Communications (MIC), Hanoi, announced a change on mobile telephony services, where all previous telephone numbers starting with 012x (mobile telephony services numbers) are moving into the other mobile number areas (e.g. to 07x or 08x etc.).

Emergency contact numbers Used in major centers

111 – Child Protection (In collaboration with the UK Government, the number now handles human trafficking calls as well as child welfare calls.) 112 – Search and Rescue services (Plans are underway to integrate 113, 114, 115 into 112) 113 – Police 114 – Fire & Rescue 115 – Ambulance Services

1900 number allocation 1900 01XX, 1900 02XX, 1900 03XX – GTEL 1900 06XXXX – GTEL 1900 12XX, 1900 15XX, 1900 17XX, 1900 18XX – VNPT 1900 20XX, 1900 21XX, 1900 22XX – CMC Telecom 1900 54XXXX, 1900 55XXXX, 1900 56XXXX, 1900 57XXXX, 1900 58XXXX, 1900 59XXXX – VNPT 1900 63XXXX – FPT Telecom 1900 66XX, 1900 68XX – FPT Telecom 1900 70XX, 1900 71XX, 1900 72XX – SPT 1900 75XXXX, 1900 77XXXX – SPT 1900 80XX, 1900 86XX, 1900 89XX – Viettel 1900 90XX, 1900 92XX, 1900 94XX – Viettel 1900 96XXXX – Viettel

Previous area codes not currently in use 120 – Mobifone 121 – Mobifone 122 – Mobifone 123 – Vinaphone 124 – Vinaphone 125 – Vinaphone 126 – Mobifone 127 – Vinaphone 128 – Mobifone 129 – Vinaphone 162 – Viettel 163 – Viettel 164 – Viettel 165 – Viettel 166 – Viettel 167 – Viettel 168 – Viettel 169 – Viettel 186 – Vietnamobile 188 – Vietnamobile 199 – Gmobile 20 – Lào Cai province (discontinued) 210 – Phú Thọ province 211 – Vĩnh Phúc province 218 – Hòa Bình province 219 – Hà Giang province 22 – Sơn La province (discontinued) 230 – Điện Biên province (discontinued) 231 – Lai Châu province (discontinued) 240 – Bắc Giang province (discontinued) 241 – Bắc Ninh province (discontinued) 25 – Lạng Sơn province (discontinued) 26 – Cao Bằng province (discontinued) 27 – Tuyên Quang province (discontinued) 280 – Thái Nguyên province (discontinued) 281 – Bắc Kạn province (discontinued) 29 – Yên Bái province (discontinued) 30 – Ninh Bình province (discontinued) 31 – Hai Phong city (discontinued) 320 – Hải Dương province (discontinued) 321 – Hưng Yên province (discontinued) 33 – Quảng Ninh province (discontinued) 350 – Nam Định province (discontinued) 351 – Hà Nam province (discontinued) 36 – Thái Bình province (discontinued) 37 – Thanh Hóa province (discontinued) 38 – Nghệ An province (discontinued) 39 – Hà Tĩnh province (discontinued) 4 – Hanoi (discontinued) 500 – Đắk Lắk province (discontinued) 501 – Đắk Nông province (discontinued) 510 – Quảng Nam province (discontinued) 511 – Da Nang city (discontinued) 52 – Quảng Bình province (discontinued) 53 – Quảng Trị province (discontinued) 54 – Thừa Thiên Huế province (discontinued) 55 – Quảng Ngãi province (discontinued) 56 – Bình Định province (discontinued) 57 – Phú Yên province (discontinued) 58 – Khánh Hòa province (discontinued) 59 – Gia Lai province (discontinued) 60 – Kon Tum province (discontinued) 61 – Đồng Nai province (discontinued) 62 – Bình Thuận province (discontinued) 63 – Lâm Đồng province (discontinued) 64 – Bà Rịa–Vũng Tàu province (discontinued) 650 – Bình Dương province (discontinued) 651 – Bình Phước province (discontinued) 66 – Tây Ninh province (discontinued) 67 – Đồng Tháp province (discontinued) 68 – Ninh Thuận province (discontinued) 70 – Vĩnh Long province (discontinued) 710 – Cần Thơ city (discontinued) 711 – Hậu Giang province (discontinued) 72 – Long An province (discontinued) 73 – Tiền Giang province (discontinued) 74 – Trà Vinh province (discontinued) 75 – Bến Tre province (discontinued) 76 – An Giang province (discontinued) 77 – Kiên Giang province (discontinued) 780 – Cà Mau province (discontinued) 781 – Bạc Liêu province (discontinued) 79 – Sóc Trăng province (discontinued) 8 – Ho Chi Minh City (discontinued) 992 – VSAT

References

External links ITU allocation data

Illustrations

Worked examples

Example 1 — a first encounter with Telephone numbers in Vietnam

Start with the simplest possible case. Write down what Telephone numbers in Vietnam 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 Vietnam 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 Vietnam 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 Vietnam

In research: Telephone numbers in Vietnam 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 Vietnam 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 Vietnam is common in secondary-school and first-year university syllabi. It links to neighbouring topics Telecommunications in Vietnam, Telephone numbers by country, Vietnam communications-related lists, so understanding it makes those chapters shorter.
In everyday life: Look for Telephone numbers in Vietnam 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.

Ask Teacher Smith questions about this articleOpens your AI tutor with a question about “Telephone numbers in Vietnam” →

Affiliate

Preply — study more efficiently by working with a personal tutor. 50% off.

How to study Telephone numbers in Vietnam in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Telephone numbers in Vietnam 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 Vietnam out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Telephone numbers in Vietnam in simple terms?

Vietnam's telephone country code is 84. The country is divided into many regions with individual area codes for landlines, as well as a separate format for mobile telephone numbers.

Why does Telephone numbers in Vietnam 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 Vietnam?

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 Vietnam.