Sender ID:
All networks are filtering on local numeric Sender IDs, so we strongly advise you not to send using a local number.
Yemen Mobile (42103) and SabaFon (42101) are being delivered via a local direct connection. All Sender IDs will be replaced by a random numeric value and delivery receipts are fake.
Content:
There are no additional content restrictions beyond those in our Acceptable Use Policy
Other features/restrictions of note:
Delivery Receipts:
Yemen Mobile (42103) and SabaFon (42101) do not have reliable delivery receipts.
Links:
Global SMS Features Overview (Outbound only)
Global SMS Numbers Features Overview