Should voice message password - protected

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On your cell phone, you might not need to enter your password before you can enter your voice message. In recent break news on newspaper and television, those news reporters can easily access people's voice message to pry the newest scoop, would that mean an invasion of privacy? We also afraid the hackers can hack into our phone, with our cell phone number and obtain our voice message. The three biggest wireless service providers just too lazy to provide customers such protection. I know it wasn't about the technological difficulty. It was whether they willing to provide such service to safe protect our privacy. Don't you think your voice message should be password - protected?