mathematics

Telephone numbers in North Korea

Telephone numbers in North Korea 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 North Korea rather than just read about it. In short: Telephone numbers in North Korea are regulated by the Ministry of Post and Telecommunications. Area codes This is the official list as registered with ITU-T in 2011.

Key takeaways

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

Reference excerpt

Telephone numbers in North Korea are regulated by the Ministry of Post and Telecommunications.

Area codes This is the official list as registered with ITU-T in 2011.

Mobile networks 0191 - Koryolink WCDMA Network 0192 - Koryolink WCDMA Network 0193 - SunNet GSM900 Network (discontinued in 2004) 0195 - Kangsong NET WCDMA, 4G LTE Network

Number lengths

Little is known about phone numbers in the rest of the country, as phone numbers outside Pyongyang and Rason are not able to be dialled from overseas and are hence not advertised in any overseas publications.

International dialing Overseas callers to North Korea will usually need to go through the international operator service on +850 2 18111. A select few numbers (mostly fax numbers) are able to be dialled directly, without operator assistance. Phone numbers in Pyongyang which can call internationally and which can receive calls internationally always begin with 381 in the local number, e.g. +850 2 381 xxxx. These numbers cannot be dialled domestically and cannot make calls domestically, so usually an organisation with international connectivity will have a 381 international number and a 382 domestic number. For example, the British Embassy in Pyongyang can be dialled as +850 2 381 7980 internationally and 02 382 7980 domestically. 381 numbers can, however, call other 381 numbers domestically. Many North Koreans smuggle in mobile phones from China and use them near the border where they can take advantage of Chinese mobile networks that work there. The North Korean government has cracked down on illegal phones by deploying surveillance and jamming devices. Many lines in the Rason Special Economic Zone can also be direct-dialled from outside the country, as many foreign companies (mostly Chinese and Russian) are active in the region. Calls between North Korea and South Korea are banned, except to or from the Kaesong Industrial Region.

References

External links North Korea at World Telephone Numbering Guide Kang Mi Jin (2017-10-30). "[Photos] Smuggled phone directory leads to nationwide confiscation effort". Daily-NK. Translated by Colin Zwirko. Retrieved 2017-10-30.

Worked examples

Example 1 — a first encounter with Telephone numbers in North Korea

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

In research: Telephone numbers in North Korea 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 North Korea 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 North Korea is common in secondary-school and first-year university syllabi. It links to neighbouring topics Communications in North Korea, North Korea communications-related lists, Telephone numbers by country, so understanding it makes those chapters shorter.
In everyday life: Look for Telephone numbers in North Korea 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 North Korea in 20 minutes

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

Frequently asked questions

What is Telephone numbers in North Korea in simple terms?

Telephone numbers in North Korea are regulated by the Ministry of Post and Telecommunications. Area codes This is the official list as registered with ITU-T in 2011.

Why does Telephone numbers in North Korea 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 North Korea?

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 North Korea.