Caller ID has been a real boon to the communications field, to be sure. Caller ID allows you to screen calls on your cell phones , for example, so that you can avoid racking up a bunch of charges talking to someone during peak hours. (It also lets you avoid getting stuck on the phone with someone you really don’t want to talk to at the moment, but we’ll just assume there’s no one like that out there.) However, caller ID is a double-edged sword

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Blocking Caller ID on Cell Phones