Mexico • NPA 643
☎️ Central Office Exchange (NXX)
+52 (643) 440 Exchange Code
Technical registry directory for telephone subscriber numbers starting with +52 (643) 440. Central office block assigned to Sonora, Mexico.
Standard Subscriber Format
+52 (643) 440-XXXX
Telecom Carrier
Local Network Carrier
Area Code (NPA)
643
Primary Location
Sonora
Service Type
Landline
📋 Central Office Exchange 440 Routing Details
The 440 exchange code (central office prefix) operates within the 643 Numbering Plan Area (NPA) servicing Sonora, Mexico. All assigned subscriber lines in this block follow ITU-T E.164 national routing protocols.
Telecommunication services within the +52 (643) 440 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
0643 440-1234or local national format. -
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International Calls: Dial
+52 643 440-1234from outside Mexico. -
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E.164 Standard:
+52643440XXXX
📞 Nearby Exchanges in Area Code 643
View All Area Code 643 Exchanges ›❓ Frequently Asked Questions
What area code is +52 (643) 440?
Phone numbers starting with +52 (643) 440 belong to the 643 area code in Sonora, Mexico, routed via exchange block 440.
How do I call a 440 exchange number from abroad?
To call this prefix internationally, dial your local exit code (e.g., 011 in North America or + globally), followed by +52, then 643, and the subscriber number.
Which provider operates the 440 prefix in Sonora?
Telecom services for the 440 exchange block in Sonora are primarily assigned to Local Network Carrier for Landline connections.