That I could forward my numbers locally to a number I choose. Say my U.S. cell, Australian, UK and Spanish cell phones: I just buy a new SIM when I'm back somewhere longer than a few days, but that's getting ridiculous (though it's cheaper than roaming). If I'm away for a while it expires, so I get yet another number. I could email everyone or call them but they have an old number for me and it's a hassle for my friends, less me as my Android phone is great at keeping me up-to-date.. so maybe it's something as simple as an iPhone/Android app that pushes cellnumber changes to your friends? I'd pay for that. I can't imagine the telcos letting go the noose on their number forwarding..