Algeria • NPA 21
☎️ Central Office Exchange (NXX)
+213 (21) 503 Exchange Code
Technical registry directory for telephone subscriber numbers starting with +213 (21) 503. Central office block assigned to Algiers, Algeria.
Standard Subscriber Format
+213 (21) 503-XXXX
Telecom Carrier
Local Network Carrier
Area Code (NPA)
21
Primary Location
Algiers
Service Type
Landline
📋 Central Office Exchange 503 Routing Details
The 503 exchange code (central office prefix) operates within the 21 Numbering Plan Area (NPA) servicing Algiers, Algeria. All assigned subscriber lines in this block follow ITU-T E.164 national routing protocols.
Telecommunication services within the +213 (21) 503 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
021 503-1234or local national format. -
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International Calls: Dial
+213 21 503-1234from outside Algeria. -
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E.164 Standard:
+21321503XXXX
📞 Nearby Exchanges in Area Code 21
View All Area Code 21 Exchanges ›❓ Frequently Asked Questions
What area code is +213 (21) 503?
Phone numbers starting with +213 (21) 503 belong to the 21 area code in Algiers, Algeria, routed via exchange block 503.
How do I call a 503 exchange number from abroad?
To call this prefix internationally, dial your local exit code (e.g., 011 in North America or + globally), followed by +213, then 21, and the subscriber number.
Which provider operates the 503 prefix in Algiers?
Telecom services for the 503 exchange block in Algiers are primarily assigned to Local Network Carrier for Landline connections.