Number associated with the invoked Message service,
i.e. the destination address used to send the message.
Element SmsMessage/smsServiceActivationNumber : anyURI[1 .. 1]
The smsServiceActivationNumber element cannot have "xsi:nil" as an attribute.
The smsServiceActivationNumber element in XML instance can be substituted with other elements.
XML Instance
Number associated with the invoked Message service,
i.e. the destination address used to send the message.