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==