China • NPA 25
☎️ Central Office Exchange (NXX)
+86 (25) 657 Exchange Code
Technical registry directory for telephone subscriber numbers starting with +86 (25) 657. Central office block assigned to Nanjing, Jiangsu, China.
Standard Subscriber Format
+86 (25) 657-XXXX
Telecom Carrier
Local Network Carrier
Area Code (NPA)
25
Primary Location
Nanjing, Jiangsu
Service Type
Landline
📋 Central Office Exchange 657 Routing Details
The 657 exchange code (central office prefix) operates within the 25 Numbering Plan Area (NPA) servicing Nanjing, Jiangsu, China. All assigned subscriber lines in this block follow ITU-T E.164 national routing protocols.
Telecommunication services within the +86 (25) 657 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
025 657-1234or local national format. -
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International Calls: Dial
+86 25 657-1234from outside China. -
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E.164 Standard:
+8625657XXXX
📞 Nearby Exchanges in Area Code 25
View All Area Code 25 Exchanges ›❓ Frequently Asked Questions
What area code is +86 (25) 657?
Phone numbers starting with +86 (25) 657 belong to the 25 area code in Nanjing, Jiangsu, China, routed via exchange block 657.
How do I call a 657 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 25, and the subscriber number.
Which provider operates the 657 prefix in Nanjing, Jiangsu?
Telecom services for the 657 exchange block in Nanjing, Jiangsu are primarily assigned to Local Network Carrier for Landline connections.