Area Code 73 – Mobile Network
The phone area code for Mobile Network is 73 (international format +42073). Browse local exchange codes (NXX) and carrier assignments below.
📞 Exchange Codes (NXX) for Area Code 73
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Overview of the +420 73 Prefix
The +420 73 prefix is a non-geographic mobile network code assigned to mobile operators in Czechia. Unlike geographic area codes, this prefix is not tied to a specific city or region; instead, it is used exclusively for mobile services, enabling subscribers to be reached anywhere in the country without changing their number. The Czech numbering plan follows ITU-T E.164, and mobile numbers under the 73 prefix have a total length of 9 digits after the country code, formatted as +420 73X XXX XXX.
Technical Allocation and Numbering
The 73 prefix is part of the national destination code (NDC) range allocated to mobile services by the Czech Telecommunication Office (ČTÚ). It is shared among multiple mobile network operators (MNOs) and virtual operators (MVNOs). The first digit after 73 (i.e., the fourth digit of the full number) often indicates the specific operator or operator group, but due to mobile number portability (MNP), the prefix no longer reliably identifies the current network. When dialing a Czech mobile number from abroad, callers must use the international format: +420 73X XXX XXX. Domestically, callers dial the same 9-digit number without any trunk prefix, as Czechia uses a closed numbering plan.
Call Routing and Portability
Mobile numbers beginning with 73 are fully portable. Subscribers can switch between MNOs and MVNOs while retaining their number. This means that the prefix does not guarantee a specific operator; routing is determined by a central number portability database. For international SMS and voice calls, the +420 country code is required. For calls within Czechia, dialing 73X XXX XXX is sufficient. No area code is needed, as the number itself is complete.
Usage and Practical Examples
These numbers are widely used for personal mobile subscriptions, business mobile lines, and data-only plans. They support standard GSM/UMTS/LTE/5G services, including voice, SMS, and high-speed data. When calling a Czech mobile number from abroad, always replace the leading zero (if present) with +420. For example, a local number 731 234 567 would be dialed as +420 731 234 567 internationally. From a foreign landline, you may need to use the international access prefix (e.g., 00 from most European countries) before the +420.
Regulatory and Cost Considerations
As with all mobile numbers, charges for calls to 73 numbers vary depending on the caller's operator and tariff. For international callers, rates are typically higher than domestic rates. It is advisable to check with your service provider for specific charges. The Czech Telecommunication Office oversees the allocation and management of these numbers, ensuring efficient use and compliance with European Union regulations.