Norway • NPA 237
☎️ Central Office Exchange (NXX)
+47 (237) 306 Exchange Code
Technical registry directory for telephone subscriber numbers starting with +47 (237) 306. Central office block assigned to Oslo, Norway.
Standard Subscriber Format
+47 (237) 306-XXXX
Telecom Carrier
Local Network Carrier
Area Code (NPA)
237
Primary Location
Oslo
Service Type
Landline
📋 Central Office Exchange 306 Routing Details
The 306 exchange code (central office prefix) operates within the 237 Numbering Plan Area (NPA) servicing Oslo, Norway. All assigned subscriber lines in this block follow ITU-T E.164 national routing protocols.
Telecommunication services within the +47 (237) 306 prefix range are primarily provisioned by Local Network Carrier, delivering local landline voice lines and network routing.
🌐 Dialing Instructions
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Domestic Calls: Dial
0237 306-1234or local national format. -
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International Calls: Dial
+47 237 306-1234from outside Norway. -
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E.164 Standard:
+47237306XXXX
📞 Nearby Exchanges in Area Code 237
View All Area Code 237 Exchanges ›❓ Frequently Asked Questions
What area code is +47 (237) 306?
Phone numbers starting with +47 (237) 306 belong to the 237 area code in Oslo, Norway, routed via exchange block 306.
How do I call a 306 exchange number from abroad?
To call this prefix internationally, dial your local exit code (e.g., 011 in North America or + globally), followed by +47, then 237, and the subscriber number.
Which provider operates the 306 prefix in Oslo?
Telecom services for the 306 exchange block in Oslo are primarily assigned to Local Network Carrier for Landline connections.