Norway • NPA 73
☎️ Central Office Exchange (NXX)
+47 (73) 556 Exchange Code
Technical registry directory for telephone subscriber numbers starting with +47 (73) 556. Central office block assigned to Sør-Trøndelag, Norway.
Standard Subscriber Format
+47 (73) 556-XXXX
Telecom Carrier
Local Network Carrier
Area Code (NPA)
73
Primary Location
Sør-Trøndelag
Service Type
Landline
📋 Central Office Exchange 556 Routing Details
The 556 exchange code (central office prefix) operates within the 73 Numbering Plan Area (NPA) servicing Sør-Trøndelag, Norway. All assigned subscriber lines in this block follow ITU-T E.164 national routing protocols.
Telecommunication services within the +47 (73) 556 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
073 556-1234or local national format. -
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International Calls: Dial
+47 73 556-1234from outside Norway. -
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E.164 Standard:
+4773556XXXX
📞 Nearby Exchanges in Area Code 73
View All Area Code 73 Exchanges ›❓ Frequently Asked Questions
What area code is +47 (73) 556?
Phone numbers starting with +47 (73) 556 belong to the 73 area code in Sør-Trøndelag, Norway, routed via exchange block 556.
How do I call a 556 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 73, and the subscriber number.
Which provider operates the 556 prefix in Sør-Trøndelag?
Telecom services for the 556 exchange block in Sør-Trøndelag are primarily assigned to Local Network Carrier for Landline connections.