Hong Kong Special Administrative Region of the People's Republic of China: SMS Features and Restrictions

We are using Adaptive Routing throughout Hong Kong which will ensure several routes are constantly being tested and the optimum one will be used for your traffic.

Sender ID:

  • For ChinaUnicomHK (45407) and ChinaMobileHK (45412):
    • All senders will be replaced by local Hong Kong numbers to ensure delivery, as alpha sender IDs are often problematic for 1sim2numbers subscribers.
  • For CSL (45400) , Hutchison (45404) , SmarTone (45406) and PCCW (45416):
    • Dynamic alpha senders within 3-11 characters length are supported,
    • Non-alpha senders are replaced by local Hong Kong numbers or “SMS” as an alpha SenderID to deliver.


There are no additional content restrictions beyond those in our Acceptable Use Policy

Concatenated messages:

Concatenated SMS are supported on all Hong Kong networks.

Other features/restrictions of note:

Delivery Receipts:
Reliable delivery receipts are supported on all Hong Kong networks.



Global SMS Features Overview (Outbound only)

Global SMS Numbers Features Overview


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