mathematics

Telephone numbers in the Czech Republic

Telephone numbers in the Czech Republic 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 the Czech Republic rather than just read about it. In short: Following the break-up of Czechoslovakia in 1993, the successor states, the Czech Republic and Slovakia, continued to share the 42 country code until 28 February 1997, with the Czech Republic then adopting 420 and Slovakia adopting 421. On September 22, 2002, the Czech Republic adopted a closed numbering plan, with nine-digit numbers used for local and national calls, and the dropping of the trunk code 0.

Key takeaways

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

Reference excerpt

Following the break-up of Czechoslovakia in 1993, the successor states, the Czech Republic and Slovakia, continued to share the 42 country code until 28 February 1997, with the Czech Republic then adopting 420 and Slovakia adopting 421. On September 22, 2002, the Czech Republic adopted a closed numbering plan, with nine-digit numbers used for local and national calls, and the dropping of the trunk code 0. Before the change, the following arrangements would have been made for calls to Brno:

Local call: xx xx xx xx National call: 05/xx xx xx xx International call: +420 5 xx xx xx xx

After the change, the dialing arrangements for calls to Brno were as follows:

Within Czech Republic: 5xx xxx xxx Outside Czech Republic: +420 5xx xxx xxx

In the case of mobile numbers, which had to be dialed in full, the only change was that the 0 was no longer used:

Within Czech Republic: 602 xxx xxx Outside Czech Republic: +420 602 xxx xxx

Emergency calls (always toll-free) General emergency: 112 Ambulance: 155 Police: 158 Fire brigade: 150 Municipal police: 156 Mountain rescue service: 1210 Other Emergency Numbers:

Urgent gas leak: 1239 Emergency Road Service (ABA): 1240 Emergency Road Service (ÚAMK): 1230

Services Numbers O2 offers several over-the-phone information services for a fee. Note that many of the services are offered only in Czech:

Info Line (Czech Number Directory): 1180 Info Line (Foreign Number Directory): 1181 Operator for changed numbers (re-numbering): 141 11 Information on air quality: 141 10 Exact time: 141 12 Weather: 141 16 Medical Information: 141 20 Operator for international phone calls: 133 003

Prefixes The first 1–3 digits (after +420) of the telephone number indicates location or network. For mobile phones, since there is number portability, the mobile phone code only indicates the original operator. For example, when a person calls a number starting with 73 (T-Mobile) but had been ported to another operator, a short voice message in Czech and English is played stating "you are calling out of a T-Mobile network" before the ringing tone. It is possible to disable this voice message.

Geographical

Mobile networks 601 xxx xxx 602 xxx xxx 603 xxx xxx 604 xxx xxx 605 xxx xxx 606 xxx xxx 607 xxx xxx 608 xxx xxx 702 xxx xxx 703 xxx xxx 704 xxx xxx 705 xxx xxx 72x xxx xxx 73x xxx xxx 77x xxx xxx 790 xxx xxx 791 xxx xxx 792 xxx xxx 793 xxx xxx 794 xxx xxx 795 xxx xxx 797 xxx xxx 799 xxx xxx

601 – O2 Czech Republic (formerly NMT, numbers were ported to GSM in 2006; also used as part of the PPP log-in when dialling in the CDMA network) (formerly named EuroTel) 602 – O2 Czech Republic (GSM system) 603 – T-Mobile Czech Republic 604 – T-Mobile Czech Republic 605 – T-Mobile Czech Republic 606 – O2 Czech Republic 607 – O2 Czech Republic 608 – Vodafone Czech Republic (formerly named Oskar) 70 – (formerly Bleskmobil's range) 72 – O2 Czech Republic 73 – T-Mobile Czech Republic 77 – Vodafone Czech Republic 790 – O2 Czech Republic

Non-geographic networks 910 – VoIP

Institutional networks These prefixes belong to the following networks:

9522 – Všeobecná zdravotní pojišťovna, government-controlled health insurance company 9555 – Bank "Komerční banka (KB)", a part of the Société Générale (SG) international group, formerly government-controlled company 9567 – Bank "Česká spořitelna (ČS)", a part of the Erste Bank Group, formerly government-controlled company 972 – Czech Railways and Railway Administration 973 – Ministry of Defence & Armed Forces of the Czech Republic 974 – Ministry of the Interior

Special pricing 800 – Zelená linka ("Green line") – toll-free (800 00 – Home Country Direct) 844 (also 81, 83, 843, 845, 846, 855) – Modrá linka (Blue line) – local call tariff from all Czech landlines 840 (also 841, 842, 847, 848, 849) – Bílá linka (White line) – national call tariff from all Czech landlines 90 – premium tariff 971 – dial-up internet access 976 xx – premium-priced dial-up internet access (priced at CZK xx per minute)

References

117/2007 Vyhláška o číslovacích plánech sítí a služeb elektronických komunikací (in Czech) Horská služba – kontakty (in Czech) Přidělená čísla a kódy (in Czech)

Worked examples

Example 1 — a first encounter with Telephone numbers in the Czech Republic

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

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

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

Frequently asked questions

What is Telephone numbers in the Czech Republic in simple terms?

Why does Telephone numbers in the Czech Republic 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 the Czech Republic?

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 the Czech Republic.