Tricks for w810 and most other SE phones

Create Contact Pictures
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Creating contact pictures --> Zoom in on the face and save as large. Did not try saving as small or other size, so dont know how it will appear.

Block a group
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Create a new group of contacts, from Contacts | Options | Groups (you could name the group Blacklist or something else). Assign any people / phone numbers to that group.
Set a profile which has the Accepted callers set to that new group.
Now you don't have to bother any unacceptable callers.