How often do you hear someone ask, "What did we do before cellphones?" One of the many answers is: we relied on our memories. Studies have shown that using our memories improves reasoning and creativity. Yet, because of our increased reliance on technology, few of us can even recall phone numbers or appointments. Try remembering and entering numbers by hand or picturing your weekly calendar in your mind.
This will not only help you use your mind in a healthy way, but may save you when the inevitable happens and your Blackberry or iPhone goes down.