The smartphone is a phenomenal piece of technology, and I'll be honest when I say that even after owning one since they appeared on the market I'm still coming up with new uses for the things.
...The solution is to put your most vital information — say, the phone numbers of your spouse and other emergency contacts — on the lock screen, so that it's the first thing someone sees when they power up the phone.
...The smartphone's SMS or text messaging function makes this easy to do; send short messages to your trusted contacts as to where you're going, what you're doing, and when you'll be back.
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