Sender ID:
For All Macau networks numeric senderID will be changed to Hong Kong numbers to ensure delivery, dynamic alpha senderID are supported towards:
45500 SmarTone
45501 CTM
45503 Hutchison
Content:
There are no additional content restrictions beyond those in our Acceptable Use Policy
Unicode:
Unicode is fully supported.
Concatenated messages:
Concatenated messages are fully supported.
Other features/restrictions of note:
Delivery Receipts:
Nexmo supports handset delivery receipts on the below networks:
45500 SmarTone
45501 CTM
45503 Hutchison
For messages sent to 45502 China Telecom, handset delivery receipts are unfortunately not supported.
Links:
Global SMS Features Overview (Outbound only)
Global SMS Numbers Features Overview