I am teaching my children about their address this week and how the mail system works. I was going to work on having them learn their phone numbers as well (although many of them already know theirs) when I realized I didn't know which number to have them memorize. These days we might expect them to know Mom's cell number, Dad's cell number, sister's cell number; all along with their main home phone number (which may never be used). (This topic is humorous considering I couldn't repeat many cell phone numbers from memory since my phone has a memory of its own).
Crazy how the world is moving so fast, and what an affect it has on education!