@KaBoom - I'm woefully behind the times as well. I didn't even know there was such a thing as a SIM card editor!
I'm considering switching to a new cell phone provider soon and I think something like this might really come in handy. I don't know if the new provider will help me transfer all my stuff from my old phone with the old provider but I kind of doubt it. I think it would be a good idea to have a way to do it myself.