This can be done from the phones "Settings and Security" menu. Here, there is the option to bar calls from a specific number. To do this, however, one will need a password from their network provider.
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If you are on a contract SIM it will depend on the contents of your tariff. If you on pay as you go / pay as you talk it will cost you.
If they were deleted off both the SIM card and phone memory you can't retrieve them.
You can't. the only way you can block a number is to call your provider
Take out the battery, stick your knob in it. Wiggle it just a little bit and hey presto blocked calls activated...
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