Yes, and No. Governed by the FCC, the Telephone Consumer Protection Act (TCPA) is the major anti-telemarketing law that regulates SMS marketing in the United States. It clearly prohibits businesses from sending messages, even to their own customers, without their consent. This holds true even if an individual has had a long-standing relationship with the company. Businesses need to obtain explicit consent to add subscribers to their subscription list. Therefore with consent, you can. But without consent, you can’t even text your own customers who might have bought from you in the past!