# 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.

- Canonical URL: https://www.broadnet.me/coverage/hong-kong
- Language: en
- Last updated: 2026-10-21
- Publisher: BroadNet (https://www.broadnet.me)

Direct termination into CSL Mobile, China Mobile HK, 3HK, and SmarTone, with OFCA's voluntary SMS Sender Registration Scheme supported.

## Key facts

- Regulator: OFCA (Office of the Communications Authority)
- Dialling code: +852
- MCC: 454
- Mobile subscribers: 23M
- Sender-ID lead time: Free-form (OFCA scheme voluntary)
- Time to launch: Live in 5–15 business days from test-access request to production
- Typical OTP latency: 2.7 s
- Typical delivery rate, operator-direct: 99.6%
- SMS price band: USD 0.035 – 0.06 (indicative list rates, reviewed 2026-09-24)
- Billing currencies: USD, HKD

## Operators

| Operator | MNC | Route | Grade | A2P rate |
|---|---|---|---|---|
| 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 |

## 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).

| Technical facts | |
|---|---|
| Mobile country code (MCC) | 454 |
| Dialling code | +852 |
| Operators (MCC-MNC) | CSL Mobile · 454-00; China Mobile HK · 454-12; 3HK · 454-04; SmarTone · 454-06 |
| 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) |

## Pricing

| Band | Transactional | Promotional | Note |
|---|---|---|---|
| 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 |

## Sender ID

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.

OFCA SMS Sender Registration Scheme: voluntary; organisations apply to OFCA directly.

## Rules

- **Sender 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.

## Compliance

PDPO (Personal Data Privacy Ordinance) enforced by PCPD. SMS Sender Registration Scheme means registered alphanumeric IDs get '#' prefix to distinguish from scams.

## Sample A2P template

```text
Your verification code is 384921.
```

Chinese (T):

```text
您的驗證碼是 384921。
```

## Related

- https://www.broadnet.me/regulations/hong-kong
- https://www.broadnet.me/pricing/sms/hong-kong