Shared Short Codes or Common Short Codes are the five to six digit numbers that is used for multiple marketing campaigns through the leasing of keywords to different entities. SMS campaigns are powered by common short code. It is ideal for customer engagement. With these campaigns, businesses can provide an instant two-way dialog to support a wide range of promotions and customer service programs. A common short code is one shared by more than one company. Typically, a text marketing provider leases a common short code and then sub-leases it to numerous organizations.