Recently sprint gave me a replacement phone and they couldn't copy my numbers over.. At first I was outraged, the thought of having to reprogram all of those numbers into my new phone seemed like an insurmountable task. I don't have a nice phone, so don't even ask about why I don't sync it with my computer... But here's the deal, when I was in high school, I knew EVERYone's number. Old friends, new friends, ALL of my friends, numbers. By heart. After getting my numbers taken from me, I realized that I didn't know some of my closest friends' phone numbers. So I decided to learn them... all of them. Sure I have my address book on my mac, to refer back to, but I have learned most of my friends' phone numbers. The only number I have in my phone is my wife's, and that's just in case something ever happened to me who ever had found my phone would know who to call. I suggest everyone do this. It's a good exercise in memory.