Canada • NPA 403
☎️ Central Office Exchange (NXX)
+1 (403) 257 Exchange Code
Technical registry directory for telephone subscriber numbers starting with +1 (403) 257. Central office block assigned to Calgary, Canada.
Standard Subscriber Format
+1 (403) 257-XXXX
Telecom Carrier
Local Network Carrier
Area Code (NPA)
403
Primary Location
Calgary
Service Type
Landline
📋 Central Office Exchange 257 Routing Details
The 257 exchange code (central office prefix) operates within the 403 Numbering Plan Area (NPA) servicing Calgary, Canada. All assigned subscriber lines in this block follow ITU-T E.164 national routing protocols.
Telecommunication services within the +1 (403) 257 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
0403 257-1234or local national format. -
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International Calls: Dial
+1 403 257-1234from outside Canada. -
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E.164 Standard:
+1403257XXXX
📞 Nearby Exchanges in Area Code 403
View All Area Code 403 Exchanges ›❓ Frequently Asked Questions
What area code is +1 (403) 257?
Phone numbers starting with +1 (403) 257 belong to the 403 area code in Calgary, Canada, routed via exchange block 257.
How do I call a 257 exchange number from abroad?
To call this prefix internationally, dial your local exit code (e.g., 011 in North America or + globally), followed by +1, then 403, and the subscriber number.
Which provider operates the 257 prefix in Calgary?
Telecom services for the 257 exchange block in Calgary are primarily assigned to Local Network Carrier for Landline connections.