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Hello there!
Not sure if this may shed light on the subject but:
WAP Push SI (Service Indication) is a special service SMS which allows operators
or everyone else to provide an easy way for alerting the smartphone user about new
services or online resources. (see specification WAP-167 for further details)
Some Smartphones fail to properly display the originator of this kind of message
which leads to a sender obfuscation.
Source

I know it's kind of an old source, but still may be relevant.
However, something newer:
http://www.geekzone.co.nz/forums.asp?forumid=97&topicid=191527
 
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