| http://www.w3.org/ns/prov#value | - SMS supports messages sent from one user to another, as well as messages sent from a machine, such as a PC, application or server, to a user. 3.1 SMS Advertising Unit Definitions The recommended ad units for SMS are as follows: Initial SMS Ad (Appended) is a universal text ad unit of variable length (often between 20-60 characters) appended to the content (or body) portion of the message containin
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