| http://www.w3.org/ns/prov#value | - Optionally, the SMSC proxy 430 may check, for example, whether sender device 401 is a subscriber that requested that its outgoing SMS messages may be modified, e.g., in exchange for a reduced sending fee or no sending fee; and in one embodiment, SMSC proxy 430 may allow modification of SMS messages transmitted by only such subscribers, or by other pre-defined types or groups of subscribers.
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