Sender ID (SID) is a name or number the recipient will see as the sender of the message on his mobile device. 

SID is created at the first stage of Campaign creation and is assigned to that campaign. Please make sure to select your desired SID as it cannot be changed after the campaign was created.
To send with a different SID, please create a new campaign with the SID you wish to send from.  
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Note that SID can be up to 11 characters, without spaces.
Some routes might rewrite the Sender ID, and display random numeric digits instead.