China • NPA 633
☎️ Central Office Exchange (NXX)
+86 (633) 321 Exchange Code
Technical registry directory for telephone subscriber numbers starting with +86 (633) 321. Central office block assigned to Rizhao, Shandong, China.
Standard Subscriber Format
+86 (633) 321-XXXX
Telecom Carrier
Local Network Carrier
Area Code (NPA)
633
Primary Location
Rizhao, Shandong
Service Type
Landline
📋 Central Office Exchange 321 Routing Details
The 321 exchange code (central office prefix) operates within the 633 Numbering Plan Area (NPA) servicing Rizhao, Shandong, China. All assigned subscriber lines in this block follow ITU-T E.164 national routing protocols.
Telecommunication services within the +86 (633) 321 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
0633 321-1234or local national format. -
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International Calls: Dial
+86 633 321-1234from outside China. -
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E.164 Standard:
+86633321XXXX
📞 Nearby Exchanges in Area Code 633
View All Area Code 633 Exchanges ›❓ Frequently Asked Questions
What area code is +86 (633) 321?
Phone numbers starting with +86 (633) 321 belong to the 633 area code in Rizhao, Shandong, China, routed via exchange block 321.
How do I call a 321 exchange number from abroad?
To call this prefix internationally, dial your local exit code (e.g., 011 in North America or + globally), followed by +86, then 633, and the subscriber number.
Which provider operates the 321 prefix in Rizhao, Shandong?
Telecom services for the 321 exchange block in Rizhao, Shandong are primarily assigned to Local Network Carrier for Landline connections.