Please choose the correct ending to complete the given sentence: Education and Communications: [header] How to block people from calling you on your home phone [title] Use caller id. [step] You can identify the caller before picking up the phone and, if it is an unwanted call, hang up or let the call go to your messaging service. [title] Block a phone number.

Ending1: [step] If you know that you will be blocked, that way you can unblock the number before trying to pick up the phone. This method works fairly broadly, because you'll only need one number left for a caller to call. Ending2: [step] The rule of thumb is no one calls you from home with a number they don't know. The most effective way to block a phone number is to block it. Ending3: [step] Nearly all phone companies have ways in which you can block calls from specified numbers. With some companies, it can be done by entering a code and then typing the number to be blocked. Ending4: [step] There are many ways you can block a phone number in various ways. [substeps] For many telemarketing companies, that is not possible.

Answer format: ending1/ending2/ending3/ending4