A2P SMS, OTP, and sender ID rules in Hong Kong.
BroadNet delivers A2P SMS and OTP in Hong Kong over direct connections to CSL Mobile, China Mobile HK, 3HK, and SmarTone; sender IDs need no formal pre-registration with OFCA. Direct termination into CSL Mobile, China Mobile HK, 3HK, and SmarTone, with OFCA's voluntary SMS Sender Registration Scheme supported.
From-rates by channel in Hong Kong
- SMSfrom$0.0460per SMSIndicative list rate, reviewed September 24, 2026Volume pricing available
- OTPRequest a quote Channel list rate from $0.0120 per verification (all markets)
- WhatsAppRequest a quote Channel list rate from $0.0135 per template message (all markets)
- RCSRequest a quote Channel list rate from $0.0080 per session (all markets)
- VoiceRequest a quote Channel list rate from $0.0150 per minute (all markets)
Indicative list prices in USD, excluding taxes and sender-ID registration fees. Final per-operator pricing is confirmed in your quote.
The Hong Kong A2P market at a glance.
Hong Kong is served by 4 licensed mobile networks (CSL Mobile, China Mobile HK, 3HK, and SmarTone) covering a subscriber base of 23M. Office of the Communications Authority (OFCA) regulates A2P messaging and sender-ID registration. OFCA's SMS Sender Registration Scheme (since 28 December 2023) is voluntary: registered senders' IDs carry a "#" prefix, and unregistered IDs are still delivered without it. Chinese (Traditional) and English supported. PDPO (Personal Data Privacy Ordinance) enforced by PCPD. SMS Sender Registration Scheme means registered alphanumeric IDs get '#' prefix to distinguish from scams.
Technical facts for Hong Kong
Network codes, message lengths and sender-ID rules in one table. Segment lengths are the GSM standard values (3GPP TS 23.038).
| Mobile country code (MCC) | 454 |
|---|---|
| Dialling code | +852 |
| Operators (MCC-MNC) |
|
| SMS length, GSM-7 (Latin alphabet) | 160 characters in a single SMS; 153 per part when concatenated |
| SMS length, UCS-2 (Arabic, Cyrillic and other scripts) | 70 characters in a single SMS; 67 per part when concatenated |
| Regulator | OFCA (Office of the Communications Authority) |
| Sender-ID rules | OFCA's SMS Sender Registration Scheme (since 28 December 2023) is voluntary: registered senders' IDs carry a "#" prefix, and unregistered IDs are still delivered without it. Chinese (Traditional) and English supported. |
| Sender-ID lead time | Free-form (OFCA scheme voluntary) |
Channels live in Hong Kong.
One contract, one contact model. Fall back between SMS, WhatsApp, and Voice with shared opt-in evidence and a single audit trail.
SMS
Operator-direct A2P with local-language script support where applicable.
OTP
Sub-4-second median; flash-call OTP available in select markets as a low-latency alternative.
WhatsApp Business API live. High consumer penetration across South and Southeast Asia.
RCS
RCS Business Messaging available on Google's MaaP where the carrier has enabled it.
Voice
Voice OTP and TTS available as fallback; recommended for high-fraud verticals.
How do I register a sender ID in Hong Kong?
Filed end-to-end by BroadNet's compliance team — KYC pack, operator approval, and renewal cycles handled on your behalf.
OFCA · CSL Mobile and China Mobile HK
- Format
- Alphanumeric; registered IDs carry a "#" prefix
- Pre-registration
- Voluntary — organisations apply to OFCA's SMS Sender Registration Scheme directly; unregistered IDs are delivered without the "#"
- KYC documents
- Confirmed during onboarding
- Renewal cycle
- Confirmed during onboarding
- Common rejection causes
- Sender-ID rules are set by the operators; BroadNet confirms current requirements during onboarding.
What OTP delivery looks like in Hong Kong.
Latency profile, peak-hour behaviour, recommended fallback chain, and the fraud signals our firewall watches in-market.
Typical latency window
Median 2.7 s with a 95th-percentile inside 8 seconds across operator-direct binds. Two-shot delivery confirmed by DLR.
Peak-hour behaviour
Operator throughput holds steady through local business peaks; throttling kicks in only during outlier mass-send events. BroadNet load-shapes per-MNO to avoid firewall blocks.
Fallback chain
Recommended fallback: WhatsApp OTP → Voice OTP after 30s. Flash-call OTP is an option in markets where the carrier permits it.
Fraud signals we watch
Flash-call abuse, SIM-farm OTP harvesting, and template variance attacks are the dominant signals. BroadNet's anomaly engine watches per-MSISDN velocity.
What you can — and can't — send.
Opt-in, opt-out, quiet hours, content restrictions, and the penalty regime for the Hong Kong market.
Opt-in
Verifiable opt-in required, with traffic categorised by use case at the time of registration. DLT-style template approval applies in several markets.
Opt-out
STOP keyword and DND-registry suppression applied automatically. Records retained per regulator requirements.
Quiet hours
We have not found a regulator-published time-of-day window for promotional SMS in this market. Agree sending hours with the operator and schedule promotional sends for the recipient's local daytime; transactional traffic runs 24/7.
Content restrictions
Local-language templates preferred. Loan, gambling, crypto, and supplements blocked at the operator firewall.
Regulator penalties
OFCA penalties for off-template, off-category, or grey-route traffic — fines, sender-ID delisting, and template re-registration required.
Termination,
network by network.
The route status column shows how each operator is reached — a direct BroadNet bind or a labelled partner route. No grey-route exposure. Route grades are indicative planning guides, not live measurements.
| Operator | MCC-MNC | Route status | Grade | A2P rate (typ.) |
|---|---|---|---|---|
| CSL Mobile | 454-00 | Direct | A+ | USD 0.0516 |
| China Mobile HK | 454-12 | Direct | A+ | USD 0.0494 |
| 3HK | 454-04 | Direct | A | USD 0.0471 |
| SmarTone | 454-06 | Direct | A | USD 0.046 |
Rates shown are typical pay-as-you-go for transactional traffic. Promotional traffic is priced separately, and volume tiers reduce both. See the rate-card section below for the full ladder.
| Tier | Transactional | Promotional | Notes |
|---|---|---|---|
| Pay-as-you-go | USD 0.0460 | USD 0.056 | List rate up to 100K messages/month |
| Growth · 100K+ | USD 0.0405 | USD 0.0493 | Auto-tier discount |
| Volume · 1M+ | USD 0.0340 | USD 0.0414 | Includes quarterly route review |
| Enterprise | Custom | Custom | Direct operator pricing + signed SLA |
OFCA SMS Sender Registration Scheme: voluntary; organisations apply to OFCA directly.
Open the Hong Kong rate cardCompliant
by default.
Every send is pre-screened against Office of the Communications Authority (OFCA) rules, the operator firewalls, and the local privacy framework. Where registration is required, BroadNet files the paperwork on your behalf.
PDPO (Personal Data Privacy Ordinance) enforced by PCPD. SMS Sender Registration Scheme means registered alphanumeric IDs get '#' prefix to distinguish from scams.
Full regulatory deep-diveSender Registration Scheme
Voluntary OFCA scheme: registered senders' IDs carry a "#" prefix; unregistered IDs are delivered without it. Organisations apply to OFCA directly.
PDPO
Hong Kong PDPO enforced by PCPD.
Opt-out language
Promotional SMS must include opt-out.
Traditional Chinese
UCS-2 routes native for Chinese.
Programmes that work well in Hong Kong.
Where the BroadNet operator-direct footprint, the local regulator regime, and consumer messaging habits line up.
- 01
E-commerce OTP, order confirmation, and dispatch alerts at festival-season scale.
- 02
Fintech, lending, and digital-wallet OTP and KYC-step notifications.
- 03
Ride-hail, food-delivery, and logistics rider-and-rider coordination messages.
- 04
Travel and airline itinerary changes, check-in, and visa-status updates.
- 05
Government citizen-services notifications and public-sector campaign messaging.
What we run for Hong Kong senders.
The operator relationships, the compliance workflow, the routing position — all on a single contract and a single account team.
Operator-direct binds with CSL Mobile, China Mobile HK, and 3HK — no aggregator hops, no grey-route exposure.
Sender-ID requirements confirmed during onboarding.
Live in 5–15 business days from test-access request to production, with a dedicated solution engineer through go-live.
Typical delivery rate 99.6% and typical OTP delivery time 2.7 s across the country.
Template approval and DLT-style category management handled in-platform.
Local-language UCS-2 routing first-class — no transliteration penalty.
Buyer questions about Hong Kong.
The questions BroadNet's sales engineers field every week from teams shipping into this market.
What's the typical sender-ID approval time with OFCA in Hong Kong?
Typical lead time: Free-form (OFCA scheme voluntary). BroadNet confirms the current sender-ID requirements and documents during onboarding.
Are BroadNet's routes to Hong Kong operator-direct?
Yes — every operator on the public coverage table is a direct A2P bind. No aggregator hops, no grey-route exposure. Route grades are indicative planning guides, not live measurements.
Can I send marketing SMS in Hong Kong without prior consent?
No. Verifiable opt-in is required across every market BroadNet supports, with the consent source, timestamp, and channel logged. Transactional OTP and account-level alerts are exempt from marketing-consent rules.
Which channels do you support for Hong Kong — SMS only, or also WhatsApp and Voice?
SMS, OTP, WhatsApp Business, and Voice OTP are all supported. RCS Business Messaging is available where the local operator has launched it. All channels run on the same contract and contact model.
Can I be billed in a currency other than USD?
Yes — billing is available in USD / HKD. Volume tiers apply automatically from 100K messages a month.
Do I need a local-language version of my templates for Hong Kong?
For consumer-facing transactional and marketing traffic, yes — a local-script template materially improves trust and recall. BroadNet handles UCS-2 routing without a price or SLA penalty.
What happens if a route to Hong Kong degrades?
BroadNet runs continuous DLR monitoring on every operator. If a route flaps, traffic is automatically re-shaped to the next-best operator on the same destination, and your account manager is notified with a remediation note within the hour.
Do you sign an SLA for traffic to Hong Kong?
Yes — traffic to this market runs under BroadNet's standard SLA: 99.99% monthly platform uptime, with service credits on enterprise contracts. Support response targets and the credit schedule are published on our Support & SLA page.
A ready-to-adapt template for Hong Kong.
In the local script alongside English. Copy, swap the brand, and we'll register it as part of your sender-ID onboarding.
- Mobile subscribers
- 23M
- Sender ID lead
- Free-form (OFCA scheme voluntary)
- Time-to-launch
- Live in 5–15 business days from test-access request to production
- Billed in
- USD / HKD
Your verification code is 384921.
您的驗證碼是 384921。
OFCA's SMS Sender Registration Scheme (since 28 December 2023) is voluntary: registered senders' IDs carry a "#" prefix, and unregistered IDs are still delivered without it. Chinese (Traditional) and English supported.
Continue across the region.
See how enterprises put these operator-direct routes to work in banking and finance messaging and e-commerce and retail messaging, or weigh the options on the messaging platform comparison hub.
More on Hong Kong
Request current route availability for Hong Kong.
Live in 5–15 business days from test-access request to production. Sender ID filed with OFCA on your behalf. Billed in USD from day one.
$ curl -X POST https://api.broadnet.me/sms/sendSms·mno = +852