Area Code 77 – Mobile Network
The phone area code for Mobile Network is 77 (international format +42077). Browse local exchange codes (NXX) and carrier assignments below.
📞 Exchange Codes (NXX) for Area Code 77
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Overview of the +420 77 Mobile Prefix
The +420 77 prefix is a non-geographic mobile network code assigned within the Czech Republic's national numbering plan, as administered by the Czech Telecommunication Office (ČTÚ). Unlike geographic area codes, which correspond to specific regions, the 77 prefix is used exclusively for mobile services, enabling subscribers to be reached regardless of their physical location. This prefix is part of the E.164 international numbering scheme, where the full international dialing format is +420 77 XXX XX XX (or +420 77XXXXXXXX, totaling 9 digits after the country code).
Technical Allocation and Numbering
In the Czech numbering plan, mobile numbers are nine digits long, including the leading '7' that identifies the service as mobile. The '77' prefix is one of several mobile codes (e.g., 601–608, 70x, 72x–79x) allocated to Mobile Network Operators (MNOs) and Mobile Virtual Network Operators (MVNOs). The prefix does not indicate a specific operator; rather, it is shared among multiple providers, and number portability allows users to retain their number when switching operators. This means that a number starting with +420 77 could belong to any Czech mobile operator, depending on the current porting status.
Dialing Procedures
- Domestic calls (within Czechia): Dial the national significant number (NSN) without the country code: 77 XXX XX XX.
- International calls to Czechia: Dial the international access prefix (e.g., 00 from most countries), then the country code 420, followed by the NSN: +420 77 XXX XX XX.
- International SMS and MMS: Use the same international format: +420 77 XXX XX XX.
Regulatory and Operational Aspects
Mobile numbers under the 77 prefix are non-geographic, meaning they are not tied to a specific city or region. This facilitates national roaming and number portability, as mandated by EU regulations. Calls to +420 77 numbers are typically charged according to the caller's mobile or fixed-line tariff, and may be subject to roaming charges if the caller is outside their home network's coverage area. For businesses, using a 77 prefix can be advantageous for nationwide presence without the need for multiple geographic numbers.
Practical Examples
To illustrate, a subscriber might have the number +420 77 123 4567. A caller from Prague would dial 77 123 4567, while an international caller from the United States would dial 011 420 77 123 4567. For SMS, the same international format is used. It is important to note that the 77 prefix is not reserved for any specific operator, so users should not assume a particular carrier based solely on the prefix.