Sender ID:
There are no known restrictions on Sender ID to Niger.
Content:
There are no additional content restrictions beyond those in our Acceptable Use Policy
Adult content:
No adult content is allowed.
Political content:
No political content is allowed.
Other features/restrictions of note:
Delivery Receipts:
Delivery receipts are supported.
Links:
Global SMS Features Overview (Outbound only)
Global SMS Numbers Features Overview