Hong Kong phone code +852: mobile format & how to dial

How to dial

Calling from abroad +852 5123 4567

Dial +852, then the local number. E.g. the landline 2123 4567 is dialled from abroad as +852 2123 4567. Generate the full number →

Calling a mobile locally 5123 4567

No trunk prefix — dial local and long distance numbers directly.

Mobile length: 8 digits
Mobile prefixes: XXXX XXXX
Landline format: XXXX XXXXe.g. 2123 4567
International format: +852 XXXX XXXX
Domestic trunk: (none)

Sign-up availability

What to expect when signing up for these services with a physical SIM from this country:

ChatGPT Not supported

Claude Not supported

WhatsApp Works

Telegram Works

LINE Works

WeChat Works

X Works

TikTok Not supported

Gemini Works

Applies to every platform: VoIP / virtual numbers and heavily-reused number pools get rejected. Physical SIM only.

Checked 2026-09-12. Platform region policies and number-range allocations change — always confirm against each platform’s official supported-regions list and the carrier’s notices.

3 sources

help.openai.com/articles/7947663 www.anthropic.com/supported-countries support.google.com/gemini?p=gemini_web_availability

How to read a number

+85251234567

+852Country/region code: Hong Kong.
5First digit: Shows the service type: 2, 3 (and 58) are fixed lines; 5, 6 and 9 are mobile, with 4, 7 and 8 opened to mobile from 2017 onwards.
1234567Remaining 7 digits: Allocated to carriers in blocks; with number portability you can’t tell the current carrier.

Hong Kong has no area codes and no trunk prefix — every number is dialled as 8 digits.

This section checked 2026-09-13.

2 sources

www.ofca.gov.hk/filemanager/ofca/en/content_311/no_plan.pdf www.info.gov.hk/gia/general/201802/05/P2018020500306.htm

Number ranges & quality

Range	Type	Notes
`Starts with 4 / 5 / 6 / 7 / 8 / 9 (8 digits)`	Mobile carrier	8-digit numbers; 4, 7 and 8 were opened for mobile from 2017 onwards.

Intl SMSStable

Virtual-number riskLow

ID requiredID is required for contracts, and prepaid cards also need real-name registration.

Key point: Hong Kong +852 is on neither OpenAI's nor Anthropic's supported-regions list, so signing up for ChatGPT or Claude with a Hong Kong number fails outright. Gemini and X work. TikTok withdrew from the Hong Kong market in 2020, so Hong Kong numbers cannot register it. Social apps (WhatsApp, Telegram, LINE, WeChat) are unaffected.

Carriers & prefixes

Mobile prefixes by carrier.

Number portability applies — a prefix only shows the original carrier.

Porting rules in full

Since March 1999.

HKT Mobile carrier

Notable brands: csl, 1O1O, Club SIM
Hutchison Telephone Mobile carrier

Notable brands: 3HK
SmarTone Mobile carrier

Notable brands: SmarTone
China Mobile Hong Kong Mobile carrier

Notable brands: CMHK

This section checked 2026-09-13.

3 sources

www.info.gov.hk/gia/general/199902/23/0223084.htm www.info.gov.hk/gia/general/201802/05/P2018020500306.htm www.ofca.gov.hk/en/consumer_focus/guide/hot_topics/sim_registration/reference_guide/index.html

SIM cards & keeping a number

Since March 2022 every prepaid SIM in Hong Kong must be registered under a real name, up to 10 cards per person per operator. To keep a number, buy a card with a long validity and top up before it expires — once expired the number is cancelled and can’t be recovered.

SoSIM

Number-keeping SIM

Network: 3 Hong Kong network
Price: Official: top-ups from HK$200 come with bonus credit
Keeping the number: Top up before expiry to extend: HK$200 gives 365 days, HK$500 or more up to 730 days (official top-up bonus page). Once expired the number is cancelled for good. Some users say a small yearly add-on purchase also extends it — unverified.
ID check: Real-name registration required
SMS & calls: A normal Hong Kong number; SMS and calls work

Pros

A single top-up can last up to two years
A Hong Kong carrier number

Watch out

Real-name registration required
Forget to renew and the number is gone

Where to buy: sosimhk.com

3 sources

www.sosimhk.com/tc/offer/top-up-bonus.html www.ofca.gov.hk/en/consumer_focus/guide/hot_topics/sim_registration/index.html feichashao.com/sosim

csl / China Mobile Hong Kong annual cards

Number-keeping SIM

Network: csl (HKT) / China Mobile Hong Kong
Price: csl annual card about HK$148 (6GB China/HK/Macau data); CMHK prepaid about HK$159 (2025 prices)
Keeping the number: Valid for a year; renew or top up before it expires
ID check: Real-name registration; non-residents usually use a passport (check with the operator)
SMS & calls: A normal Hong Kong number; SMS and calls work

Pros