Most networks are filtering numeric Sender ID. Use an alphanumeric Sender ID, such as your brand name, or this will be changed to "NXSMS" to ensure delivery.
There are no additional content restrictions beyond those in our Acceptable Use Policy.
Other Features or Restrictions
Handset delivery receipts are supported to all networks.
Unicode is supported to all networks.
Concatenated messages are supported to all networks.
For more information, see the following articles: