Hong Kong 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 Sender IDs 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 Sender IDs within 3-11 characters length are supported.
  • Non-alpha Sender IDs are replaced by local Hong Kong numbers or “SMS” as an alpha Sender ID 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 or Restrictions

Delivery Receipts

Reliable delivery receipts are supported on all Hong Kong networks.

Additional Information

For more information, see the following articles:

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