1. Can I use SFDC Campaigns for sending bulk SMS?

Yes, SFDC campaigns can be used to send out bulk messages, but only through Contact and leads object.

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.