Hong Kong phone number format
Country code +852, 8 digits after it. Below is the same example written every way you are likely to need it.
Example mobile number
This is a numbering-plan example, not a real subscriber’s line. It is generated from the same data the validator uses, so it always matches what the API accepts.
Check a real Hong Kong number
Formatting is the easy half. The validator reports whether the number is actually allocated, its line type, and a risk score — free, no signup.
Open the free phone validator →From your code
curl "https://www.layercall.com/v1/lookup/phone?phone=%2B85251234567" \
-H "X-Api-Key: YOUR_KEY"1,000 lookups a month free, no card. Get an API key.
Questions
What is the country code for Hong Kong?
Hong Kong's country calling code is +852. In E.164 — the format almost every API, SMS gateway and CRM expects — it is written with no spaces, brackets or dashes, like +85251234567.
How many digits is a Hong Kong phone number?
8 digits after the +852 country code. Written nationally it may show no trunk prefix.
Does the leading 0 get included when dialling Hong Kong from abroad?
Hong Kong numbers do not use a national trunk prefix, so the national and international digits are the same after the +852 country code.
Is a correctly formatted number the same as a real one?
No, and conflating the two is the usual mistake. Formatting only says a number could exist. It does not say whether the range was ever allocated, whether it is mobile, fixed line or VoIP, or whether it is worth trusting on a signup — those need a lookup against numbering-plan data.