There is usually a 3 day rule
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When you get their phone numbers they tell when to call, or if you call them they'll tell you when to call again.
Call your phone company and ask them how to get the unwanted numbers blocked. Be aware that they will probably charge you a fee for blocking the numbers.
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If the call is from a commercial organisation then a simple web search should solve the problem. Many phone directory websites offer reverse look up for numbers that are listed in that directory.
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There are a few websites that offer international phone numbers for sale. A few of these companies that sell international phone numbers are Fly Number, World Numbers and Call Centric.
Your phone call should be free if it is a local call to a house phone. Ultimately it depends on your calling plan and where your calling to. The home phone line you call should not be charged for receiving a call.
Apparently any numbers beginning with 08 reverse charge the person being called. Therefore they would call a person, with an advertisement, and then charge that person for the phone call. That is why the recipient of the call should avoid, and not answer the call.
A person with a cell phone can put that number on the National do Not Call Registry. The do not call registry shows telephone numbers that are not okay to call.
A phone should not randomly call someone by itself unless it is touchscreen. If your phone is not touchscreen, you may be putting it somewhere where it is being pressed and poked causing it to dial 411 or other numbers. You should put the name of your phone in the question to more details but for now that's all i can say. Hope this helps :)
halo