Custom Sender ID
The Sender ID is the number or text shown on a handset when it displays a message. You set a custom Sender ID to better represent your brand.
Overview The Sender ID can be either:
Numeric - up to a 12 digit telephone number in international format without a leading [+] or 
Alphanumeric - an 11 character string of supported characters .
Note: Using other characters may result in failed delivery or an altered Sender ID.