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California provides an exception-You can record someone without their consent, if it will be used to prove kidnapping, extortion, bribery, or a violent felony. Most states will not allow you to record someone in furtherance of your own crime or tort.
Well, I really don't know what you might want to use it for, if it's for court, some states do allow you to record a conversation without informing the party being recorded, I believe that is only if they call you on your phone and you record it, or if they approach you and start the conversation. You need to check with your local state laws.