Sender ID:
Orange Madagascar (64602) is filtering heavily on Sender ID. Alphanumeric Senders will be blocked and also some Numeric in International format such as: 47xxxxxx, 44xxxxxxxx, 22xxxxxx and most likely other senders as well.
We recommend to always test before switching live traffic.
Content:
There are no additional content restrictions beyond those in our Acceptable Use Policy
Other features/restrictions of note:
Delivery Receipts:
Handset delivery receipts are supported.
Links:
Global SMS Features Overview (Outbound only)
Global SMS Numbers Features Overview