Sender ID:
VIP Macedonia (29403) and ONE (29402) are filtering messages with alphanumeric and shortcode Sender IDs and therefore they will be switched to random number in order to ensure delivery. We suggest using an international format numeric Sender ID to bypass this filtering.
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