Using Alphanumeric Sender ID for SMS

Why is whitelisting for Alphanumeric Sender IDs required?
Plivo enforces stringent checks on the use of alphanumeric sender ids to ensure that all communication that flows through Plivo is legitimate, and in no way...
Under what scenarios could Plivo reject my request for Alphanumeric Sender ID whitelisting?
Plivo will first and foremost seek to verify the legitimacy of your business, as it applies to the sender Id you wish to use.  In some cases, we may re...