The +85 country code is the international dialing prefix assigned to Hong Kong, enabling global callers to reach the territory from any phone network. It is used before the local number to ensure calls are correctly routed across international borders.
Businesses, travelers, and residents rely on this code to connect reliably across regions, whether by voice, SMS, or digital services. Understanding how and when to use +85 helps avoid failed connections and unnecessary charges.
| Country | Country Code | Typical Dialing Format | Special Notes |
|---|---|---|---|
| Hong Kong | +85 | +85 2XXXX XXXX (landline) | Territory with its own dialing plan, not a sovereign state |
| Brazil | +55 | +55 XX XXXX XXXX | Largest country in South America by population |
| United Kingdom | +44 | +44 20 XXXX XXXX | Country code for England, Scotland, Wales, and Northern Ireland |
| Japan | +81 | +81 XX XXXX XXXX | Often confused with +85 due to similar numeric patterns |
Calling Hong Kong from Abroad
How to Dial Correctly
To call Hong Kong from another country, dial your international access code (00 or +), followed by 85, then the local number. For landlines, drop any leading zero; for mobiles, keep the full subscriber number after the country code.
Mobile vs Landline Formats
Mobile numbers in Hong Kong typically start with 9 and are 8 digits after the country code, while landlines use area code 2 and are 7 or 8 digits. Always include the +85 prefix when storing contacts in international format to avoid confusion.
Business and SMS Use Cases
Corporate Communications
Global companies use +85 for customer support lines, marketing SMS, and verification OTP delivery to Hong Kong-based users. Proper formatting in CRM systems reduces bounce rates and improves deliverability.
Application and Service Integration
SaaS platforms that operate in Hong Kong often require +85 numbers for account confirmation, two-factor authentication, and regulatory compliance. APIs that accept E.164 format simplify integration and avoid parsing errors.
Number Portability and Regulation
Porting and Number Transfer
Under Hong Kong telecommunications regulation, subscribers can retain their +85 number when changing service providers. Portability supports competition and reduces churn, subject to identity verification and eligibility checks.
Spam Control and Compliance
Regulators enforce strict rules on commercial SMS and automated calls to +85 numbers. Organizations must maintain explicit consent records, honor opt-outs promptly, and use compliant messaging platforms to avoid penalties.
Global Connectivity Strategies
- Store contacts in E.164 format with +85 to ensure reliable dialing from any device
- Verify carrier coverage and roaming agreements before traveling to or from Hong Kong
- Use compliant messaging platforms for SMS campaigns targeting +85 numbers
- Regularly audit telecom expenses to detect unexpected charges linked to international usage
- Configure phone systems to normalize local and international dialing rules for Hong Kong
FAQ
Reader questions
Is +85 the same as +1 for international calls?
No, +85 is assigned to Hong Kong, while +1 covers the United States and Canada. Using the wrong country code will result in failed call routing.
Do I need to dial +85 when calling from within Hong Kong?
No, local calls within Hong Kong do not require the country code. You can dial the local number directly, but some mobile apps may still require the full international format.
Can I use +85 for VoIP and internet calls?
Yes, VoIP services accept +85 numbers for outbound calls. Ensure your provider supports Hong Kong destinations and that your account is properly verified to prevent suspension.
Will my existing Hong Kong number keep +85 when I travel internationally?
Yes, your +85 number remains unchanged when you travel. You may incur roaming charges depending on your plan, so consider local SIM cards or international roaming packages.