Greece • NPA 21
☎️ Central Office Exchange (NXX)
+30 (21) 310 Exchange Code
Technical registry directory for telephone subscriber numbers starting with +30 (21) 310. Central office block assigned to Athens/Piraeus/Salamina, Greece.
Standard Subscriber Format
+30 (21) 310-XXXX
Telecom Carrier
Local Network Carrier
Area Code (NPA)
21
Primary Location
Athens/Piraeus/Salamina
Service Type
Landline
📋 Central Office Exchange 310 Routing Details
The 310 exchange code (central office prefix) operates within the 21 Numbering Plan Area (NPA) servicing Athens/Piraeus/Salamina, Greece. All assigned subscriber lines in this block follow ITU-T E.164 national routing protocols.
Telecommunication services within the +30 (21) 310 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
021 310-1234or local national format. -
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International Calls: Dial
+30 21 310-1234from outside Greece. -
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E.164 Standard:
+3021310XXXX
📞 Nearby Exchanges in Area Code 21
View All Area Code 21 Exchanges ›❓ Frequently Asked Questions
What area code is +30 (21) 310?
Phone numbers starting with +30 (21) 310 belong to the 21 area code in Athens/Piraeus/Salamina, Greece, routed via exchange block 310.
How do I call a 310 exchange number from abroad?
To call this prefix internationally, dial your local exit code (e.g., 011 in North America or + globally), followed by +30, then 21, and the subscriber number.
Which provider operates the 310 prefix in Athens/Piraeus/Salamina?
Telecom services for the 310 exchange block in Athens/Piraeus/Salamina are primarily assigned to Local Network Carrier for Landline connections.