Portugal • NPA 21
☎️ Central Office Exchange (NXX)
+351 (21) 437 Exchange Code
Technical registry directory for telephone subscriber numbers starting with +351 (21) 437. Central office block assigned to Lisbon, Portugal.
Standard Subscriber Format
+351 (21) 437-XXXX
Telecom Carrier
Local Network Carrier
Area Code (NPA)
21
Primary Location
Lisbon
Service Type
Landline
📋 Central Office Exchange 437 Routing Details
The 437 exchange code (central office prefix) operates within the 21 Numbering Plan Area (NPA) servicing Lisbon, Portugal. All assigned subscriber lines in this block follow ITU-T E.164 national routing protocols.
Telecommunication services within the +351 (21) 437 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
021 437-1234or local national format. -
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International Calls: Dial
+351 21 437-1234from outside Portugal. -
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E.164 Standard:
+35121437XXXX
📞 Nearby Exchanges in Area Code 21
View All Area Code 21 Exchanges ›❓ Frequently Asked Questions
What area code is +351 (21) 437?
Phone numbers starting with +351 (21) 437 belong to the 21 area code in Lisbon, Portugal, routed via exchange block 437.
How do I call a 437 exchange number from abroad?
To call this prefix internationally, dial your local exit code (e.g., 011 in North America or + globally), followed by +351, then 21, and the subscriber number.
Which provider operates the 437 prefix in Lisbon?
Telecom services for the 437 exchange block in Lisbon are primarily assigned to Local Network Carrier for Landline connections.