77. How to set the sender Id specific to users so that only the sender Id assigned to the user should be visible to him while sending messages?

You need to configure Sharing Settings if you wish to restrict the user from viewing any sender ID other than his own.

Important Announcement!

URGENT! Please register the 10-digit business phone number (e.g. 555-555-5555) that your organization uses to send texts to consumers in the U.S. Failure to register may cause heavy penalties and disruption to all your text messaging communications.