If you’re like one of 91 percent of Americans who own a cellphone, or the 81 percent who send and receive text messages on that cellphone, or the 60 percent that access the Internet, or the 52 percent that send or receive email on their phones, then the police would love to get their hands on your device.

Think about any random day. You make phone calls, which tells the phone companies where you are and who you’re talking to. You send text messages, which stores the content of your conversation. You take pictures, which are stored on your phone. And you download apps that have your bank account and credit card information, maybe even some medical records.