Do you have any 3rd party software installed? Some apps access the incoming messages and cause the SMS commands to fail. Note the exact syntax you use to send the command? (For example: #LOCK#12345678)
Also, on Symbian to use the remote lock, keep the device lock turned on.
Thanking you for your assistance/solution ... the problem was simply syntax related.
I was learning from: http://www.f-secure.com/en/web/home_global/anti-theft ... which misled me a little.
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