I have solved this problem a slightly different way, and I realize that it is not perfect. 90% of my business is conducted within the US, here I have a single

I have solved this problem a slightly different way, and I realize that it is not perfect. 90% of my business is conducted within the US, here I have a single number I give out. This number is managed by Ribbit (www.ribbit.com , no affiliation). Ribbit knows a list of numbers for me: Office desk phone "Mobile" IP Phone (eg: sometimes it is at my house, or at my condo if I am spending more than a few days there, or possibly even travels with me if I am going someplace for an extended time). iPhone 3GS which has numbers in the US, Dubai, Caribbean and Japan via multiple SIMS. iPhone 4 which has a US number. When you call my Ribbit number, it rings ALL these services simultaneously, whichever phone I pick up is the one that gets the call. I can take numbers out of the routing loop if I want (for example when I travel, I don't need my home phone to ring and bug my wife). So, to reach me, you dial a single number. The downside to it is CallerID. While I can jump through some hoops to use apps and soft phones to get around this, it's a PITA (to me), so if I call you back from Japan for example, you're going to likely see my Japanese phone number as the caller ID, but I get more calls than I make, so it's not a huge problem. The phonebook to DNS analogy is also off in that we all have "bookmarks" of sites we want to revisit and keep in a handy list. DNS has not solved or removed the issue of list keeping and organization/management.