Hong Kong phone number validator
How the phone number format works
- Format
- Hong Kong phone number in national or international (+852) format
- Example
- +85251234567
Things to watch for
- Accepts national or international (E.164, e.g. +852...) format
- Validated with Google's libphonenumber; confirms the number is possible/valid for this country, not that it is currently assigned or reachable
^[+]?[0-9 ()\-]{6,}$A Hong Kong phone number is 8 digits, with no area code and no trunk prefix — among the simplest numbering plans anywhere. Mobile numbers start with 5, 6, or 9 (9123 4567); landlines start with 2 or 3 (2345 6789). Converting to international form is pure addition: +852 goes in front of the same 8 digits, nothing dropped or reshuffled, because Hong Kong never adopted a trunk zero in the first place.
How this validator works
Type the 8 digits alone (91234567) or with the country code (+85291234567); this tool checks the length and leading-digit range against Hong Kong’s real numbering plan using Google’s libphonenumber, entirely client-side. Because there’s no trunk prefix to strip, the most common formatting error here isn’t a leftover 0 — it’s simply too many or too few digits, since 8 is a strict count with no regional variation.
What a pass doesn’t tell you
A pass confirms the 8 digits match a valid Hong Kong mobile or landline pattern — it doesn’t confirm the SIM is active or the landline connected. Hong Kong’s mobile market turns over prepaid numbers quickly, so a correctly-shaped number can be reassigned to someone else entirely.
Scope: catch a missing digit, an extra digit, or a wrongly-added 0 before a Hong Kong number reaches a form or SMS gateway — not confirmation it currently belongs to anyone.
Content last reviewed 2026-07-07.
phone number FAQ
How many digits does a Hong Kong phone number have?
Exactly 8, for both mobile and landline numbers, with no area code and no trunk prefix — the international form is simply +852 followed by those same 8 digits, nothing added or removed.
How can I tell a Hong Kong mobile number from a landline?
By the first digit: mobile numbers start with 5, 6, or 9, while landlines start with 2 or 3 — both are 8 digits total, so the leading digit is what distinguishes them, not the length.
Does a valid Hong Kong number check mean it's currently assigned to someone?
No. It only confirms the 8 digits match a real Hong Kong numbering pattern — it can't confirm the SIM or line is currently active, and Hong Kong's prepaid mobile market recycles numbers often enough that format validity alone tells you little about who holds it now.