I have a tmobile Samsung blast phone. I was wondering how would i block all numbers that come into my phone, except for those that are currently saved in my phone book. Say for instance 555-7867 calls my phone but this number is not in my contacts...how would i BLOCK them.

I have read the instruction manual, but it doesnt clarify exactly how to do this. Can anyone give me the step by step instructions on how this is to be done. I would appreciate it very much.